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Table of Contents
Summary of Contents for MED Nuklear-Medizintechnik Dresden GmbH CoMo 170 V20
- Page 1 User’s Manual C o M o 170 Contamination Monitor...
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Page 2: Further Menu Restrictions
Issue 2015/03 KE subject to technical changes... -
Page 3: Table Of Contents
CoMo user´s manual Contents Use and function Principle of measurement Advantages Setup and installation Battery check Operation of the CoMo Operating functions 5.1.1 Menu overview 5.1.2 Turn on / off device 5.1.3 Button functions 5.1.4 Menu function for external devices Start screen Measurement display Numeric Measuring display Graphic... - Page 4 CoMo user´s manual 6.1.5 Unit Measurement settings 6.2.1 Bar graph - Display 6.2.1.1 Display – numeric 6.2.1.1.1 Bar graph 6.2.1.2 Measurement display – graphic 6.2.1.2.1 Measurement display – further settings 6.2.2 Background measurement 6.2.2.1 Background Input 6.2.2.2 Further settings Background measurement 6.2.3 Average determination 6.2.3.1...
- Page 5 CoMo user´s manual 6.4.4 Menu escape time 6.4.5 Service 6.4.5.1 Menu restrictions 6.4.5.1.1 Further Menu Restrictions 1 6.4.5.1.2 Further Menu Restrictions 2 6.4.5.1.2.1 Language selection 6.4.5.2 Minimum and maximum thresholds 6.4.5.3 Gamma correction 6.4.5.4 Factory settings 6.4.5.5 Servicecode Language Acoustics 6.6.1 Acoustic pulse 6.6.2...
- Page 6 CoMo user´s manual 8.1.2 Measurement result 8.1.3 Acoustic 8.1.4 Quick menu 8.1.5 Main menu active wall station 8.1.5.1 Code input 8.1.5.2 Main menu items 8.1.5.3 Measure settings 8.1.5.4 Background measurement The CoMo as a smear test counter 8.2.1 The active smear test counter 8.2.2 Accessories smear test counter 8.2.3...
- Page 7 CoMo user´s manual 8.4.2 Geiger-Müller contamination probes and special 1-channel counter probes 8.4.2.1 Measurement display 8.4.2.2 Acoustics menu 8.4.2.3 Quick menu 8.4.2.3.1 Probe alarm threshold 8.4.3 Special 2-channel count probes 8.4.3.1 Measurement display 8.4.3.2 Acoustics menu 8.4.3.3 Quick menu 8.4.3.3.1 Probe Alarm thresholds 8.4.3.3.2 Background measurement...
- Page 8 CoMo user´s manual 11.2.2 Large-area plastic-scintillation detectors 11.2.2.1 Measuring-technical data Foil replacement and foil repair 12.1 Removal of the foil 12.2 Repair of the foil 12.3 Assembly of the detector Accessories 13.1 Additional probes 13.1.1 Dose rate probes 13.1.2 Geiger-Müller contamination / smear test probes and special 1-channel count probes 13.1.3 Special 2-channel count probes...
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Page 9: Use And Function
CoMo user´s manual Use and function Contamination may occur wherever people are working with radi- oactive material. A portable contamination monitor is used to de- tect surface contaminations by radioactive material. For this kind of detection, a large-area detector is used. The pulses measured by the detector and the electronics can be made visible as a measurement value and audible as acoustic pulses. -
Page 10: Principle Of Measurement
CoMo user´s manual Principle of measurement The decay of radio-nuclides is accompanied by the emission of radiation, e.g. gamma rays (photons). These photons are meas- ured by a detector which converts each photon into an electrical signal. Scintillator Light reflector Secondary electronics multiplier to amplifier Photocathode... -
Page 11: Advantages
CoMo user´s manual Advantages innovative detector technology with plastic scintillation- detector no gas-filled or gas flow detectors. Therefore, no gas supply is required. High repair costs of gas-filled detec- tors (xenon detectors) are avoided. α-, β- and γ-contamination measurement with only one detector. - Page 12 CoMo user´s manual data storage for 750 data records In connection with the optionally available wall station, the CoMo can be used as a stationary contamination meter. In connection with the optionally available smear test station, the CoMo can be used as a smear test counter. possibility to connect external detectors, e.g.
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Page 13: Setup And Installation
CoMo user´s manual Setup and installation The CoMo is supplied with power by 2 standard batteries TYPE AA. With new batteries (approx. 2500 mA/h), the CoMo can be used approx. 25-30 hours. For operation with rechargeable batteries, the instrument has an intelligent charging connection with approx. -
Page 14: Operation Of The Como
CoMo user´s manual Operation of the CoMo LCD display button Acoustics + 128 x 64 pixels Special functions (shown on display) sound exit for internal speaker socket for RS 232 socket for exter- interface, mains op- nal detectors eration or charging On/Off button Quick menu Menu: Up button... -
Page 15: Operating Functions
CoMo user´s manual Operating functions Menu overview 5.1.1 The program structure of the CoMo as a diagram: S ta rt s cree n Ac ou stic s N u clide sele ctio n (*) S tart m e asu rem en t (*) C o ntinu ou s m e asu re m . -
Page 16: Turn On / Off Device
CoMo user´s manual Turn on / off device 5.1.2 The CoMo is operated by means of a foil keyboard. To turn on the device, the On/Off button has to be pushed until the start screen appears (approx. 2 seconds). The device can be turned off in the Quick menu. -
Page 17: Menu Function For External Devices
CoMo user´s manual The parameters are set according to the following scheme: 1. Parameters which can be activated or deactivated are displayed in square brackets. If the parameter is deac- tivated, the position between the brackets is empty [ ]. If the parameter has been activated by the Enter button, a cross is shown between the brackets [X]. -
Page 18: Start Screen
CoMo user´s manual Start screen The start screen provides an overview of the software status, the battery voltage and indicates possible system errors. company device name name device serial software version number date / time battery voltage Display: Company name Device name Serial number Software version... -
Page 19: Measurement Display Numeric
CoMo user´s manual Measurement display Numeric After the device has been turned on and the start screen has ap- peared, the instrument automatically switches to the measure- ment mode. If net measurement is set and 'BG-request' is activat- ed in the menu 'Measure settings | Background measurement | Further settings' (see 6.2.2.2) a background measurement (see 5.7.1) can be started immediately. -
Page 20: Measuring Display Graphic
CoMo user´s manual Measuring display Graphic The graphic display can be enabled via the service menu (6.4.5.1). If a graphic display (see 6.2.1.2) is selected, the curve with the parameters defined last time appears after the start screen. If the measuring value is displayed as a graph, the divid- ing factor (see 5.6) is deactivated (limited processor capacity). -
Page 21: Nuclide Selection
CoMo user´s manual Nuclide selection The CoMo contains a nuclide file with 26 nuclides, 1 double nu- clide, 1 nuclide vector and 4 cps modes. In the Main menu you can define which nuclide has to be available for measurement. This reduces the nuclide list to the nuclides that are really used when selecting a nuclide for the measurement. -
Page 22: Acoustics Menu
CoMo user´s manual Acoustics menu speaker In the search mode, the speaker is ena- button bled. If you push the speaker button shortly, the acoustic single pulses of the active channel are turned on or off. If you push longer (> 2 s) the acoustics menu is called. The function of the Acoustics menu can be hidden except for the acoustic single pulses. -
Page 23: Further Settings Acoustics Menu
CoMo user´s manual Further settings acoustics menu 5.6.1 acoustic warning acoustic warning in search mode in measuring acoustic warning warning volume volume of speaker for earphone shows possible vibration motor for button functions alarm when exceed- ing alarm threshold close acoustics menu Display: The following options are only displayed if these are activated in the main menu (see 6.6.5). -
Page 24: Quick Menu
CoMo user´s manual Quick menu The Quick menu contains important functions which have to be changed quickly during measurement. Push the On/Off button to open the Quick menu. The functions background measure- ment, gross/net measurement, stored data records and nuclide selection only appear if activated in the Main menu. -
Page 25: Background Measurement
CoMo user´s manual Background measurement 5.7.1 When measuring surface contamination, e.g. of a work bench in a laboratory, a difference has to be made between the measure- ment sign emitted by the contaminated object and the measure- ment sign coming from the radiation field in the direct area, the so called background. - Page 26 CoMo user´s manual The parameters for the background measurement are defined in the Main menu. After invoking the background measurement from the Quick menu, the last measured background is displayed and you can decide, if a new measurement has to be performed. The measurement process is started using the measuring time en- tered in the Main menu.
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Page 27: Main Menu
CoMo user´s manual Main menu Code input The access to the main menu is protected by a 4-digit code to rule out any inadvertent modification of the system parameters. The access code can be changed in the menu 'Other parameter | Code change (or Access protection)' (see 6.4.1). -
Page 28: Setting Of The System Parameters
CoMo user´s manual Setting of the system parameters submenu for submenu for nuclide setting parameter setting submenu data setting of display il- storage lumination, access submenu acoustic code, date/time etc. info menu submenu language shows possible closes menu button functions Display: Nuclide settings: define parameters of the nuclide-specific data (see 6.1) -
Page 29: Nuclide Settings
CoMo user´s manual Nuclide settings Settings of radiological parameters submenu for nuclide selection nuclide setting for the nuclide vector setting of correc- tion factor submenu for nuclide selection submenu for se- lection of display shows possible button functions closes menu Display: Nuclides: parameter setting of nuclide-based data (see 6.1.1) Nuclide vector*: activating the function and selection of the... -
Page 30: Nuclide Settings Bq - Bq/Cm²
CoMo user´s manual Nuclide settings Bq - Bq/cm² 6.1.1 After nuclide selection (see 5.5) you have to define the settings of the selected nuclide. The CoMo contains a nuclide file with 32 nu- clides. Some of the nuclide slots are pre-programmed with standard values. -
Page 31: Alarm Thresholds
CoMo user´s manual 6.1.1.1 Alarm thresholds Depending on the defined average determination (see 6.2.3), the display variation in the search mode can be higher than in the measuring mode. For this reason it is possible if enabled in menu restrictions (see 6.4.5.1) to define two different alarm thresholds adapted to the field of application: for the search mode (continuous display) for the measuring mode (measurement with measuring... -
Page 32: Autocalibration - Default Settings
CoMo user´s manual 6.1.1.2 Autocalibration – Default settings The device is equipped with an autocalibration function. This allows you to calibrate your own nuclides with present test sources. defined measur- nuclide to be ing channel calibrated test source activity start of calibration process calibration shows possible... -
Page 33: Autocalibration - Measurement
CoMo user´s manual 6.1.1.2.1 Autocalibration – Measurement Before the first autocalibration (since selecting the main menu), a background measurement is made first. If you don’t leave the main menu before the next autocalibration, no further background measurement is required. defined measuring channel nuclide to be calibrated... -
Page 34: Nuclide Settings - Cps Mode
CoMo user´s manual 6.1.1.3 Nuclide settings - cps mode If you choose one of the four cps entries during nuclide selection (see 5.5) you get to the settings for counts per second. In the cps setting menu you can only change the alarm threshold and deter- mine if the entry should be available in the nuclide selection during measurement. -
Page 35: Alarm Thresholds - Cps Mode
CoMo user´s manual 6.1.1.3.1 Alarm thresholds – cps mode In the counts per second mode you can activate two alarm thresh- olds if '2 alarm thresholds' is enabled (see 6.4.5.1). If the first alarm threshold is exceeded and quit, the second alarm threshold is activated. -
Page 36: Nuclide Vector
CoMo user´s manual Nuclide vector 6.1.2 In areas where it is usual to work with a mix of two nuclides (e.g. in a nuclear power plant Co-60 / Cs-137 mix) you can set a so called nuclide vector. For this purpose you select both pre-calibrated nu- clides from the available nuclide list and enter the relation of the nuclides according to their distribution in percent. -
Page 37: Gamma Correction
CoMo user´s manual Gamma correction 6.1.3 Due to secondary effects (see 9.2.3), present alpha radiation leads to an increased crossover from alpha into the beta/gamma chan- nel. This influence can be balanced by calculation with the so called gamma correction. This menu item can be disabled in ser- vice menu 6.4.5.1.1. -
Page 38: Nuclide Selection
CoMo user´s manual Nuclide selection 6.1.4 Here the setting for the nuclide selection is defined. submenu for nuclide selection nuclide selection in short menu possible nuclide selection selection of the via arrow buttons nuclide for measurement closes menu shows possible button functions Display: Nuclide selection... -
Page 39: Unit
CoMo user´s manual Unit 6.1.5 Here the unit of the nuclide measurement is set. heading of selection of the unit submenu for measurement unit selection in short menu possible shows possible button functions closes menu Display: Unit: If no selection of the unit is planned in the short menu, the unit can be selected here for the measurement. -
Page 40: Measurement Settings
CoMo user´s manual Measurement settings Setting of the most important device parameters setting of display parameter for back- mode ground measurem. parameter setting area over which the for measurement measured value is value smoothing to be averaged settings for meas- (mode Bq/cm²) uring mode minimum and... -
Page 41: Bar Graph - Display
CoMo user´s manual Bar graph - Display 6.2.1 With the CoMo you have the possibility to choose three different display modes for the search mode. If the graphic function is activated in the menu item 'other parame- ter | service' (see 6.4.5.1), the menu item is called 'Display' and you can choose between the numeric and the curve display as a curve or an area. -
Page 42: Bar Graph
CoMo user´s manual 6.2.1.1.1 Bar graph The CoMo offers the possibility to configure the analogue bar graph display. display of analogous bar analogous bar linear in % of the or logarithmic alarm threshold closes the dis- shows possible but- play settings ton functions menu Display:... -
Page 43: Measurement Display - Graphic
CoMo user´s manual 6.2.1.2 Measurement display – graphic In the graphic mode (see 5.4) there are two display options availa- ble: 1. graph as a curve (background line and thresholds are better to recognise) 2. graph as an area (graph better visible) If the measuring value is displayed as a graph, the dividing factor (see 5.6) is deactivated (limited pro- cessor capacity). -
Page 44: Measurement Display - Further Settings
CoMo user´s manual 6.2.1.2.1 Measurement display – further settings In the graphic mode it is possible to display the alarm threshold(s) and the background as lines in the curve. The alarm thresholds are displayed as a semicolon line and the background as a dotted line. -
Page 45: Background Measurement
CoMo user´s manual Background measurement 6.2.2 The background subtraction can be performed in three ways. 1. Background measurement (precise measurement values but long measuring times) 2. Subtraction fixed entered value (see 6.2.2.1) (measurement less precise but more quickly applicable). 3. Calculate background in the active wall station and store it as current background value after taking the instrument out of the wall station. -
Page 46: Background Input
CoMo user´s manual 6.2.2.1 Background Input The subtraction of a manually entered value saves a background measurement. The CoMo can be used more quickly. But the measuring values of a net measurement are inexact. The back- ground values which are subtracted in case of a net measurement can be entered manually in cps here. -
Page 47: Further Settings Background Measurement
CoMo user´s manual 6.2.2.2 Further settings Background meas- urement background from possibility to wallstation measure BG after the BG devia- turning on tion is controlled tolerance threshold for BG-control end of back- shows possible ground menu 2 button functions Display: Get background from wall station in the wall station mode. -
Page 48: Average Determination
CoMo user´s manual Average determination 6.2.3 6.2.3.1 Statistical error Nuclear decays, i.e. transformation of nuclei are natural, randomly distributed events. If you examine e.g. a radiation source using a detector and measures the number of registered events periodi- cally over a fixed measuring time, then you will see that an accu- mulation occurs in a certain area. - Page 49 CoMo user´s manual If a large number of measuring cycles are evaluated, the following relationship becomes apparent: Number Measured values Standard deviation (± 1 σ) % cycles in % from 68.27 95.45 99.73 99.997 99.999943 Schedule 1 This shows that it may be improbable but by no means impossible to find a measured value smaller than 50 or larger than 150;...
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Page 50: Ring Memory
CoMo user´s manual 6.2.3.2 Ring memory average determi- dynamic aver- nation with ring age calculation memory ring memory quantity shows possible button functions closes the aver- age setting Display: dynamic: The ring memory quantity is calculated and set auto- matically by means of the count rates (see 6.2.3.2.1). A dy- namic smoothing procedure is used: y = ( y(old) * (smoothing factor –1)+ count rate )/ smoothing factor The smoothing factor is calculated with the following formula:... -
Page 51: Dynamic Average Determination
CoMo user´s manual 6.2.3.2.1 Dynamic average determination: average count rate (value old): 50 cps current count rate: a = 60 cps value value − − − value − − − value The advantage of dynamic average determination is that the standard deviation is always <... - Page 52 CoMo user´s manual Example: Average value of ring memory 50 cps 5 sigma: radical from 50 cps * 5 = 35.4 cps. Deviation bigger than 5 sigma count rate < 14.6 cps or > 85.4 cps If the current count rate is > 85 cps, the ring memory is erased and refilled.
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Page 53: Detector Area
CoMo user´s manual Detector Area 6.2.4 In order to convert activities [Bq] in area-based activities [Bq/cm²] the area to be calculated has to be entered in the system. detector area for determination of the measured store new value in Bq/cm² value with Enter button meaning of the... -
Page 54: Measuring Mode - Fixed Measuring Time
CoMo user´s manual Measuring mode - fixed measuring time 6.2.5 With the CoMo, a measurement with fixed measuring time can be carried out if activated in service menu 6.4.5. For this purpose, the function has to be activated. As an alternative, the measuring time can be calculated automatically, after defining the maximum statis- tic error that is tolerated. -
Page 55: Measuring Mode - Automatic Measurement
CoMo user´s manual 6.2.5.1 Measuring mode – automatic measure- ment With the CoMo, a measurement with fixed measuring time can be carried out. Additionally a fixed time interval between the meas- urements can be defined. In this way you can make a serial measurement without having to push a button. -
Page 56: Minimum And Maximum Thresholds
CoMo user´s manual Minimum and maximum thresholds 6.2.6 The CoMo warns if its maximum limits of count rates are reached. These limits are outside the linear measuring range. It is possible to set the limits also lower. This menu item is only shown if it is ac- tivated in the 'Service' menu (see 6.4.5.1.2). -
Page 57: Detector Error
CoMo user´s manual Detector error 6.2.7 If a detector error occurs in the CoMo, i.e. no pulses are being measured, an error message is displayed after the time set below. The error is signaled visually (the display shows 'Detector Error') and acoustically (rhythmic beeping). -
Page 58: Measuring Value Storage
CoMo user´s manual Measuring value storage Up to 750 datasets can be stored in the memory of the CoMo. This function can be turned on or off in the submenu 'Parameter'. If the memory is full, this is indicated on the display. Depending on the measuring mode, the text „memory full“... -
Page 59: Parameter Measuring Value Storage
CoMo user´s manual Parameter measuring value storage 6.3.1 The evaluation and deletion of stored data in the Quick menu can be locked. In that case, these data are only available in the Main menu. Eventually present data records do not get lost af- ter deactivating. -
Page 60: Measuring Value Storage In Quick Menu
CoMo user´s manual 6.3.1.1 Measuring value storage in Quick menu The evaluation and deletion of stored data can be enabled in the quick menu, so that every user has access to these data. This is only possible if the storage in the measurement and search modes (or in both modes) is enabled. -
Page 61: Parameters Meas. Value Storage In Measuring Mode
CoMo user´s manual 6.3.1.2 Parameters meas. value storage in measuring mode The storage function can be activated and it is possible to config- ure if the values are stored automatically or on request. activate storage store after feature measurement: Yes / No automatic storage after measurement shows possible... -
Page 62: Stored Data Records
CoMo user´s manual Stored data records 6.3.2 Up to 750 datasets can be stored in the system’s memory. The function to store has to be activated in the Main menu. (see 6.3.1). To have the values also displayed in the Quick menu, the function: Values in Quick menu (see 6.3.1.1) has to be activat- add a remark to shows stored... -
Page 63: View Data Records
CoMo user´s manual 6.3.2.1 View data records The stored measurement values are shown in a list of max. 6 measurement values. After pushing the Enter button the measurement value is shown in detail. Shows the selected chart heading memory position date and value of measurement shows possible... -
Page 64: Display Of Measurement Values In Detail
CoMo user´s manual 6.3.2.1.1 Display of measurement values in detail After being selected from the list, the stored measurement values are displayed with the following details: defined alarm selected nuclide threshold or external probe selected memory type position measured value defined unit date and time of measurement... -
Page 65: Further Measurement Data
CoMo user´s manual 6.3.2.1.1.1 Further measurement data After pushing the Enter button (Next), further details to the se- lected measuring value are displayed. selected memory position remark to measuring value measuring time background meas- uring time background closes the detailed display Display: Selected memory position (maximum 750 memory positions) -
Page 66: Enter Remark
CoMo user´s manual 6.3.2.2 Enter remark In order to identify measuring values also after some time, it is possible to enter a remark to every measurement. Before adding a remark to a measurement, the measurement is selected from the list by means of the arrow buttons and confirmed with the Enter button. -
Page 67: Delete Data Record
CoMo user´s manual 6.3.2.3 Delete data record To avoid a loss of data, the system asks to confirm the deletion before the data are actually deleted. menu heading selected function: delete last data record security ques- tion before deletion deletes data aborts the record deletion... -
Page 68: Wimp Values
CoMo user´s manual Wimp values 6.3.3 Stored values, which were measured in the smear test station (see 8.2), are displayed as a table or in detail. This menu item is only displayed when values from WIMP are present, and has a similar structure as the menu item 'stored data records' (see 6.3.2). -
Page 69: Other Parameters
CoMo user´s manual Other parameters Setting of the system parameters. enable / change access code date/time setting parameter setting: settings for display menu escape time service menu closes the menu shows possible button functions Display: Access protection- Change code: The access to the Main menu is / can be protected by a 4-digit code. -
Page 70: Access Protection - Code Change
CoMo user´s manual Access protection – code change 6.4.1 In order to allow only authorized persons (e.g. radiation protection responsible persons) to change the system parameters, the ac- cess to the main menu can be protected by a 4-digit code number. The menu item can also be called 'Code change', depending on the setting of the menu item 'Access protection' in 6.4.5.1.1 0000... -
Page 71: Date/Time Setting
CoMo user´s manual Date/Time setting 6.4.2 In order to assign a correct date and time for the measurement results of the measurement value storage, the CoMo is equipped with a battery-operated clock. The clock does not switch from summer- to wintertime and vice versa automatically. -
Page 72: Display
CoMo user´s manual Display 6.4.3 Here the settings for display contrast are made and it is possible to enter a submenu for display illumination setting. settings for settings for illumination contrast shows possible back to previous button functions menu item Display: Illumination: Submenu item for setting of the display illumina- tion function (see 6.4.3.1) -
Page 73: Illumination
CoMo user´s manual 6.4.3.1 Illumination Since the illumination of the LC display requires rather much energy, the illumination can be adapted to your individual re- quirements. illumination illumination turned on turned off illumination on illumination time after button push after button push illumination automatically brightness... -
Page 74: Menu Escape Time
CoMo user´s manual Menu escape time 6.4.4 In order to make the CoMo 170 faster to operate, the function Menu escape time was introduced. This function is only useful in the Quick menu and for nuclide selection, which is the reason why the menu escape time is very short for these functions. -
Page 75: Service
CoMo user´s manual Service 6.4.5 The CoMo is optionally available with enabled service menu. 1000 The access code upon delivery is: The following functions can be set via the service menu: menu functions to be (de-)activated setting minimum / maximum thresh- setting gamma olds correction... -
Page 76: Menu Restrictions
CoMo user´s manual 6.4.5.1 Menu restrictions In order to adapt the functions of the CoMo optimally to the re- quired field of application, the item menu restrictions was integrat- ed. On the following 3 pages the possible parameter settings are shown. -
Page 77: Further Menu Restrictions 1
CoMo user´s manual 6.4.5.1.1 Further Menu Restrictions 1 Further possible parameter settings for the CoMo basic setting. enabling access display of α + β/γ protection to main menu gamma correction on/off definition of gamma dynamic averag determin- correcion in main menu ation in main menu on/off data storage on/off measuring mode in main... -
Page 78: Further Menu Restrictions 2
CoMo user´s manual 6.4.5.1.2 Further Menu Restrictions 2 The last screen of possible parameter setting for the CoMo basic setting. Automatic measure- minimum and ment in main menu maximum threshold in main submenu menu language selection shows possible end of menu button functions restrictions Display:... -
Page 79: Language Selection
CoMo user´s manual 6.4.5.1.2.1 Language selection Language selection settings submenu lan- guage selection language selection shows activated available in main language and al- menu lows to select an- other language end of menu lan- guage selection shows possible button functions Display: Language in menu: If activated, the language selection can be opened in the main menu. -
Page 80: Minimum And Maximum Thresholds
CoMo user´s manual 6.4.5.2 Minimum and maximum thresholds The CoMo warns if its maximum limits of count rates are reached. These limits are outside the linear measuring range. It is possible to set the limits also lower. minimum threshold maximum β/γ... -
Page 81: Gamma Correction
CoMo user´s manual 6.4.5.3 Gamma correction Due to secondary effects (see 9.2.3), present alpha radiation leads to an increased crossover from alpha into the beta/gamma chan- nel. This influence can be balanced by calculation with the so called gamma correction. This menu item can be disabled in ser- vice menu 6.4.5.1.1. -
Page 82: Factory Settings
CoMo user´s manual 6.4.5.4 Factory settings The CoMo can be reset to its settings upon delivery. The data are stored on two different locations (in the device and in the detector) and can therefore be reset separately. Only the device-specific settings (e.g. measuring mode, storage and display mode) are reset to their factory set- tings The detector-specific data like nuclide settings with their... -
Page 83: Servicecode
CoMo user´s manual 6.4.5.5 Servicecode In order to allow only authorized persons (e.g. radiation protection officer) to change the system parameters, the access to the ser- vice menu can be protected by a 4-digit code number. 1000 The access code upon delivery is: display of cur- rent code num- shows possible... -
Page 84: Language
CoMo user´s manual Language The setting of language can be (dis)abled in service menu (see 6.4.5.1.2.1). English German French Spanish Dutch shows possible button functions Closes menu Display: It is possible to select one of the currently 5 available languages: English German French... -
Page 85: Acoustics
CoMo user´s manual Acoustics In the submenu acoustics, the parameters for acoustic features are set. Acoustic alarm Acoustic single pulses Setting of vibration motor Sound settings Key function Acoustic for smear test counter and shows possible wall station button functions closes the submenu Display: Acoustic pulse: The acoustic single counts α, βγ... -
Page 86: Acoustic Pulse
CoMo user´s manual Acoustic pulse 6.6.1 You can activate or deactivate the acoustics for single pulses here. single pulses single pulses βγ α channel On/Off channel On / Off single pulses GM single pulses channel On/Off probe On / Off shows possible button functions closes menu... -
Page 87: Alarm
CoMo user´s manual Alarm 6.6.2 The acoustic alarm for the search and measuring mode can be (de)activated. The vibration alarm is independent from the settings made here. The acoustic alarm can also be activated/deactivated via the acoustics button (see 5.6), provided this is set in the 'Acoustics | Button function' menu (see 6.6.5). -
Page 88: Sound Settings
CoMo user´s manual Sound settings 6.6.3 Here you can set the parameters for keyboard beep, volume of speaker and earphone (accessory). The volume can also be set in the acoustics menu (see 5.6), provided this is configured in 6.6.5. volume keyboard volume of speaker beep dividing factor... -
Page 89: Vibration Motor
CoMo user´s manual Vibration motor 6.6.4 Here you can set the parameters for the vibration motor. The vi- bration motor is only activated in case of exceeding an alarm threshold. vibration off vibration when sound off vibration always vibration with pulsating headphone vibration... -
Page 90: Key Function
CoMo user´s manual Key function 6.6.5 The function of the acoustics button and the menu items which are desired to be displayed in the acoustics menu are configured here. In the search mode, the acoustics menu can be opened via the speaker button (see 5.6). -
Page 91: Smear Test Counter / Wall Station
CoMo user´s manual Smear test counter / Wall station 6.6.6 Here you can set the parameters for acoustics, when the CoMo is placed into an active wipe test station (see 8.2). You are forward- ed to the submenu 'Wall station'. Alarm Count down submenu... -
Page 92: Wall Station
CoMo user´s manual 6.6.6.1 Wall station Here you can set the parameters for acoustics, when the CoMo is placed into an active wall station (see 8.1). dividing factor for Acoustic pulse acoustic single Count down Alarm Volume shows possible button functions closes menu Display: Acoustic pulse: The acoustic single pulses are turned on/off. -
Page 93: Info
CoMo user´s manual Info The info screen is almost the same as the start screen and gives an overview of serial number, software version, battery voltage and eventual errors in the system. company device name battery voltage device serial software version number further info end of info menu... -
Page 94: Software-/ Hardware Versions
CoMo user´s manual Software-/ Hardware versions 6.7.1 For an eventually necessary diagnosis, the next screen can dis- play further information to the versions of device and detector. hardware version CoMo software version CoMo detector number software version hardware version detector detector end of info menu further info... -
Page 95: Further Adjustment Information
CoMo user´s manual Further adjustment information 6.7.2 For an eventually necessary diagnosis, the next screen can dis- play further information to the state of adjustment of the device. alpha threshold defined high discriminator voltage alpha current alpha beta/gamma count rate threshold current beta-/ discriminator... -
Page 96: Measurement
CoMo user´s manual Measurement Continuous measurement – Ratemeter mode After the device has been turned on and the start screen has ap- peared, the instrument automatically switches to the measurement mode. If net measurement is set and 'BG-request' is activated in the menu 'Measure settings | Background measurement | Further set- tings' (see 6.2.2.2) a background measurement (see 5.7.1) can be started immediately. -
Page 97: Measuring Value Storage In Search Mode
CoMo user´s manual Measuring value storage in search mode If the measurement value storage function has been activated in the Main menu (see 6.3.1), every currently displayed measure- ment value is stored after short pushing the Enter button . For this purpose, the next free memory position is used and shortly shown at the LC display after storage. -
Page 98: Measurement With Fixed Measuring Time
CoMo user´s manual Measurement with fixed measuring time If the function ”Measurement with fixed measuring time” has been activated in the Main menu (see 6.2.5), a measurement with predefined measuring time is started after pushing the Enter but- > 2 s. This can be repeated automatically with a definable interval (see 6.2.5.1). -
Page 99: Measurement With Calculated Measuring Time Based On Error Limit
CoMo user´s manual Measurement with calculated measuring time based on error limit If the function Measurement with calculated measuring time based on error limit has been activated in the Main menu (see 6.2.5), a measurement is started after pushing the Enter button (>... -
Page 100: Storage After Measurement
CoMo user´s manual Storage after measurement Depending on the setting in the submenu 'Parameter meas. value storage in measuring mode' (see 6.3.1.2) there are two options for storing. Depending on the settings, you can also add a remark (see 6.3.1). Manual: The device stores The device re-... -
Page 101: 7.6 Alarm Threshold Exceeding
CoMo user´s manual 7.6 Alarm threshold exceeding The acoustic alarm in case of an alarm threshold exceeding can be quit with the speaker button, if this was activated in the main menu (see 6.6.5), or ends as soon as the values are below the threshold again. -
Page 102: Display „Ofl" (Overflow)
CoMo user´s manual Display „Ofl“ (Overflow) If the display range (see 9.1) is exceeded, the message „Ofl“ for Overflow is displayed. Overflow – Display numeric (see 5.3): defined alarm selected threshold measuring mode measuring value selected without background measuring subtraction channel „Ofl“... -
Page 103: 7.8 Background Invalid
CoMo user´s manual 7.8 Background invalid The current gross measuring value is continuously compared to the valid background in the net mode, if this is activated (see 6.2.2.2). If the measuring value is lower than the valid background and the difference is higher than the „threshold“ value, an acoustic alarm is triggered and a message to remeasure the background appears. -
Page 104: Optional Measuring Functions
CoMo user´s manual Optional measuring functions The active wall station The CoMo can be used as a stationary contamination monitor in an active wall station. For this purpose, the device has to be placed in- to the wall station. Depending on the parameter setting, the device continuously measures the background and switches to contamina- tion measurement with fixed measuring time (e.g. -
Page 105: Measurement
CoMo user´s manual Measurement 8.1.1 The contamination monitor CoMo is a mobile measuring system equipped with large-area detectors. The available active wall sta- tion is designed in such way that the person being monitored holds his hands in front of the detector, which is installed at the bottom of the housing. -
Page 106: Measurement Result
CoMo user´s manual Measurement result 8.1.2 The measurement results are displayed at the end of the meas- urement. If contamination is detected, the measuring values are displayed in cps, Bq or Bq/cm². If no contamination has been de- tected, this will be indicated in plain-language text. defined alarm selected nuclide threshold... -
Page 107: Acoustic
CoMo user´s manual Acoustic 8.1.3 No acoustic menu available. Settings are made in main menu. Quick menu 8.1.4 The Quick menu contains important functions which have to be changed quickly during measurement (e.g. acoustic pulse on/off). Push the On/Off button to open the Quick menu. -
Page 108: Main Menu Active Wall Station
CoMo user´s manual Main menu active wall station 8.1.5 8.1.5.1 Code input The access to the main menu is protected by a 4-digit code to rule out any inadvertent modification of the system parameters. The access code upon delivery is: 0000 The digit that can be changed is flashing. -
Page 109: Main Menu Items
CoMo user´s manual 8.1.5.2 Main menu items Setting of the system parameters submenu for submenu for nuclide setting parameter setting submenu for back- acoustics menu ground measure- ment shows possible but- closes menu ton functions Display: Nuclide settings: define parameters of the nuclide-specific da- ta, as described in chapter 6.1 Measure settings: setting of measure time (see 8.1.5.3) Background: setting background measurement (see 8.1.5.4) -
Page 110: Measure Settings
CoMo user´s manual 8.1.5.3 Measure settings The measuring time for contamination measurement can be set here. Heading of this item Measure time in seconds Change measu- closes menu rement time Display: Measure time: contamination measurement with fixed measur- ing time Button functions: here no function end of menu item –>... -
Page 111: Background Measurement
CoMo user´s manual 8.1.5.4 Background measurement The background subtraction can be performed in three ways. 1. Background measurement after turning on device 2. Background measurement, if no contamination measurement is running. 3. Subtraction of a fixed entered value (measurement less pre- cise but more quickly applicable). -
Page 112: The Como As A Smear Test Counter
CoMo user´s manual The CoMo as a smear test counter The active smear test counter 8.2.1 The CoMo can be used as a smear test counter in an active smear test station. For this purpose, the device has to be placed into the smear test station. -
Page 113: Accessories Smear Test Counter
CoMo user´s manual Accessories smear test counter 8.2.2 smear test station 9 Volt charging adapter (when using rechargeable batteries) or 5 Volt power supply adapter (when using normal batteries) adapter for using 60 mm Ø sample plates 60 mm Ø sample plates in 3 mm and 8 mm height ring with 5 mm height for using 3mm plates... -
Page 114: Appropriate Smear Test Samples
CoMo user´s manual Appropriate smear test samples 8.2.3 available surface of approx. 130 x 100 mm². use of smear test samples including paper base or for non- standard smear test samples use of 120 mm Ø plates in 3mm (with 5mm distance ring) and 8mm height. -
Page 115: Measurement
CoMo user´s manual Measurement 8.2.4 The available active smear test counter is designed in such way that a measurement is initiated automatically as soon as the draw- er is opened. After inserting the measuring object and closing the drawer, the actual measurement is made. All data required for per- forming a smear test measurement are shown at the LCD display. -
Page 116: Measuring Result
CoMo user´s manual Measuring result 8.2.5 The measurement results are displayed at the end of the measure- ment. If contamination is detected, the measuring values (depend- ing on setting) are displayed in cps, Bq or Bq/cm². If no contamina- tion has been detected, this will be indicated in plain-language text. Alarm threshold exceeding: selected nuclide defined alarm... -
Page 117: Quick Menu
CoMo user´s manual Quick menu 8.2.6 The Quick menu contains important functions which have to be changed quickly during measurement (e.g. unit). Push the On/Off button to open the Quick menu. The function 'Stored data rec- ords' only appears if activated in the Main menu. unit: cps, Bq or view stored val- Bq/cm²... -
Page 118: Main Menu Smear Test Measurement
CoMo user´s manual Main menu smear test measurement 8.2.7 8.2.7.1 Code input The access to the main menu is protected by a 4-digit code to rule out any inadvertent modification of the system parameters. The access code upon delivery is: 0000 The digit that can be changed is flashing. -
Page 119: Main Menu
CoMo user´s manual 8.2.7.2 Main menu Here you can define important system parameters. submenu for submenu for parameter settings nuclide settings submenu for submenu stored acoustics settings data shows possible button functions closes the menu Display: Nuclide settings: parameter setting of measurement-specific data (see 8.2.7.3) Measure settings: setting of device options (see 8.2.7.4) Measuring value storage: Display of stored measurements... -
Page 120: Nuclide Settings Bq - Bq/Cm²
CoMo user´s manual 8.2.7.3 Nuclide settings Bq - Bq/cm² After nuclide selection (see 5.5) you have to define the settings of the selected nuclide. For the smear test mode, the CoMo contains an additional nuclide file with 8 nuclides. Some of the nuclide memory positions are pre-programmed with standard values. -
Page 121: Alarm Thresholds
CoMo user´s manual 8.2.7.3.1 Alarm thresholds Alarm thresholds for Bq and for Bq/cm² can be set. selected alarm thresh- nuclide olds in Bq/cm² alarm thresholds in Bq shows possible button functions closes alarm threshold setting Display: Nuclide to be changed Alarm threshold Bq/cm²: setting of alarm threshold for area- based measurement Alarm threshold Bq: setting of alarm threshold for activity meas-... -
Page 122: Autocalibration - Default Settings
CoMo user´s manual 8.2.7.3.2 Autocalibration – Default settings The device is equipped with an autocalibration function. This makes it possible to calibrate your own nuclides with available test sources. defined measur- nuclide to be ing channel calibrated test source activity start of calibration process calibration... -
Page 123: Autocalibration - Measurement
CoMo user´s manual 8.2.7.3.2.1 Autocalibration – Measurement Before the first autocalibration (since selecting the main menu), a background measurement is made first. If you don’t leave the main menu before the next autocalibration, no further background measurement is required. defined measuring channel nuclide to be calibrated... -
Page 124: Nuclide Settings - Cps Mode
CoMo user´s manual 8.2.7.3.3 Nuclide settings – cps mode - If you choose one of the cps entries during nuclide selection (see 5.5), you get to the settings for counts per second - memory posi- tions. In the cps setting menu you can only change the alarm threshold and determine if the entry should be available in the nu- clide selection during measurement and which measuring channel has to be used (not in the cps mode α/βγ). -
Page 125: Alarm Threshold - Cps Mode
CoMo user´s manual 8.2.7.3.3.1 Alarm threshold – cps mode - The cps alarm threshold is set the same way like the setting of the nuclide alarm thresholds. measuring channel alarm threshold closes the alarm Change entry threshold setting Display: Measuring channel: channel which the counts are measured in (α, βγ, α+βγ) Alarm threshold: setting of alarm threshold(s) in cps (counts per second) -
Page 126: Measuring Settings Smear Test Counter
CoMo user´s manual 8.2.7.4 Measuring settings smear test counter The CoMo can make a measurement as a smear test counter with fixed measuring time or, as an alternative, the measuring time can be calculated automatically, after defining the maximum desired statistical error. -
Page 127: The Como As A Doserate Meter
CoMo user´s manual The CoMo as a doserate meter The CoMo can be ordered with a Geiger-Müller counter tube for dose rate measurement. In that case, an additional high voltage, an amplifier and an extension for data transmission in the CoMo are integrated and the counter tube is integrated on the detector electronics. -
Page 128: Measurement
CoMo user´s manual Measurement 8.3.1 The integrated Geiger-Müller counter tube gives the same meas- uring results as the externally connectible probe 18550 CE from Graetz. To switch from contamination measurement to doserate measurement the unit is switched from cps (or Bq) to Sv/h in the quick menu (see 8.3.2.1). -
Page 129: Settings Doserate Measurement
CoMo user´s manual Settings doserate measurement 8.3.2 8.3.2.1 Quick menu The Quick menu contains important functions which have to be changed quickly during measurement (e.g. switch between doserate and contamination measurement). Push the On/Off but- to open the Quick menu. The function 'Stored data' records only appears if activated in the Main menu. -
Page 130: Alarm Threshold Settings Doserate Measurement
CoMo user´s manual 8.3.2.1.1 Alarm threshold settings doserate meas- urement probe type and menu heading defined alarm threshold change alarm closes menu threshold The alarm threshold can be set within a range from 0.1 µSv/h till 19.99 mSv/h. To switch the unit you have to select it and set the desired unit µSv/h or mSv/h with the arrow buttons. -
Page 131: Utilisation Of External Detectors
CoMo user´s manual Utilisation of external Detectors In order to comply with special requirements, external detectors can be connected to the CoMo, for example for dose rate meas- urement. The CoMo automatically recognizes if an external probe is connected. An external probe can be connected and discon- nected during operation. -
Page 132: Dose Rate Probe
CoMo user´s manual Dose rate probe 8.4.1 Here the deviations from the CoMo user's manual of the probes listed in chapter 13.1.1 are described. 8.4.1.1 Measurement display After the device has been turned on and the start screen has ap- peared, the instrument automatically switches to the measurement mode. -
Page 133: Quick Menu
CoMo user´s manual 8.4.1.3 Quick menu The Quick menu contains important functions which have to be changed quickly during measurement (e.g. acoustic pulse on/off). Push the On/Off button to open the Quick menu (see also 5.7). The function 'Stored data records' only appears if activated in the Main menu. -
Page 134: Probe Alarm Threshold
CoMo user´s manual 8.4.1.3.1 Probe alarm threshold Here you can change the alarm threshold of the external probe. The changed value is stored in the CoMo. This value will be load- ed again the next time you are using this probe type. menu heading alarm threshold in µSv/h... -
Page 135: Geiger-Müller Contamination Probes And Special 1-Channel Counter Probes
CoMo user´s manual Geiger-Müller contamination probes and 8.4.2 special 1-channel counter probes Here the deviations from the usual manual structure CoMo (see chapter 6) of the probes listed in the 13.1.2 are described. 8.4.2.1 Measurement display After the device has been turned on and the start screen has ap- peared, the instrument automatically switches to the measurement mode. -
Page 136: Acoustics Menu
CoMo user´s manual 8.4.2.2 Acoustics menu See 8.4.1.2. 8.4.2.3 Quick menu See 8.4.1.3. 8.4.2.3.1 Probe alarm threshold Here you can change the alarm threshold of the external probe. The changed value is stored in the CoMo. This value will be load- ed again the next time you are using this probe type. -
Page 137: Special 2-Channel Count Probes
CoMo user´s manual Special 2-channel count probes 8.4.3 Here the deviations from the CoMo user's manual of the probes listed in the 13.1.3 are described. 8.4.3.1 Measurement display After the device has been turned on and the start screen has appeared, the instrument automatically switches to the meas- urement mode. -
Page 138: Acoustics Menu
CoMo user´s manual 8.4.3.2 Acoustics menu See 8.4.1.2. 8.4.3.3 Quick menu The Quick menu contains important functions which have to be changed quickly during measurement. Push the On/Off button to open the Quick menu. The functions background measure- ment, gross/net measurement, stored data records and nuclide selection only appear if activated in the Main menu. -
Page 139: Probe Alarm Thresholds
CoMo user´s manual 8.4.3.3.1 Probe Alarm thresholds Here you can change the alarm thresholds of the external probe for the different measuring channels. The changed values are stored in the CoMo. These alarm thresholds are loaded again the next time you are using this probe type. menu heading alarm thresholds in cps... -
Page 140: Background Measurement
CoMo user´s manual 8.4.3.3.2 Background measurement Further description of background measurement see chapter 5.7.1. The header of the menu item shows that the background meas- urement is carried out for the external probe. background count background rate of α channel measurement external background count... -
Page 141: Measuring Mode
CoMo user´s manual 8.4.3.3.3 Measuring mode Here the measuring channel(s) is/are set. Thresholds in menu heading end of menu shows possible button functions Display: Mode: channel which the counts should be measured with α: measurement only in α channel βγ: measurement only in βγ channel α+βγ: measurement in α... -
Page 142: 1-Wire Probes (Intelligent Probes)
CoMo user´s manual 1-Wire probes (intelligent probes) 8.4.4 With 1-wire probes, various data are stored in the probe and are selected automatically by the CoMo. In the 1-wire probe described here, for example, nuclide data are stored on the probe. A part of the stored data can be changed through entries in the CoMo menu and will then be stored changed in the probe. -
Page 143: Detector Area
CoMo user´s manual 8.4.4.2 Detector Area In order to convert activities [Bq] in area-based activities [Bq/cm²] the area to be calculated has to be entered in the system. When using an external probe, the activity calculation refers to the measuring area of the external probe. This measuring area is stored on a 1-wire probe. -
Page 144: Technical Specifications
CoMo user´s manual Technical specifications Device Detector type: large-area, thin-layer plastic scintillation detec- tors with ZnS coating for α- ß-γ measurements with integrated photomultiplier, high voltage generation and pulse processing. Measuring channels: internal: one α-channel and one ßγ-channel. external: two pulse inputs Start of measurement: •... - Page 145 CoMo user´s manual Measuring time: continuous (with definable ring memory). In measuring time mode and in stationary mode definable in seconds Display: large-area, graphic LCD display 128 x 64 pixels Voltage: 3 Volt. 2 x batteries type: AA Mignon (LR6) Power consumption: approx.
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Page 146: Detector Contamination Measurement
CoMo user´s manual Detector Contamination measurement Detector type: zinc sulphide coated plastic scintillator with mag- netically shielded photomultiplier Detector size: approx. 170 x 100 x 1 mm³ Cover grid: Standard: honeycomb grid, 0.5 mm strong, maximum opening 7 mm and 78% transpar- ency. - Page 147 CoMo user´s manual Warning! A long storage period can lead to a high background rate. After having used the device for a while again, the normal background value appears again. To check the CoMo, switch the device to gross measurement and observe the background count rate.
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Page 148: Photomultiplier
CoMo user´s manual Photomultiplier 9.2.1 9.2.1.1 Data sheet page 148... -
Page 149: Measurement-Technical Data
CoMo user´s manual Measurement-technical data 9.2.2 Background count rate at 50 nSv/h: α: approx. 0.1 cps β/γ: approx. 15 - 25 cps 9.2.2.1 Radionuclide efficiency: Mean values from measurements with 100 cm² specimen: Assumed background: α: 0.2 cps, β/γ: 15.0 cps C-14 approx. -
Page 150: Detection Limits
CoMo user´s manual 9.2.2.2 Detection limits: Calculated according to DIN ISO 11929 ⋅ ⋅ Detection limit in in Bq: α − − ⋅ α − ⋅ ⋅ Decision threshold in Bq: α − ... -
Page 151: Influence Of Alpha Counts In The Beta Channel
CoMo user´s manual Influence of alpha counts in the beta 9.2.3 channel Thanks to the special construction of the detector it is possible to measure alpha and beta/gamma radiation simultaneously. Mylar foil for light-tight covering of the detector ZnS-coating of the scintillator for alpha measurement plastic scintillator for beta- / gamma measurement... - Page 152 CoMo user´s manual • Alpha-message during beta/gamma-measurement When the measuring chan- βγ- measurement, α- alpha- radiation is detected, an al- message pha-message is blinking as soon as the alpha count rate is 1 cps. • Exceeding alpha threshold during beta/gamma- measurement In case of high alpha radiation, the measuring values for beta/gamma radiation cannot be accepted as regular measuring...
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Page 153: Detector Dose Rate Measurement (Optional)
CoMo user´s manual Detector Dose rate measurement (Optional) Type of radiation: for gamma and x-ray measurement (DC instal- lations) Calibration: using gamma radiation, Cs 137 Measuring size: area-equivalent dose rate H *(10) Nominal working range of the photon energy: 40 keV-1.3 MeV Dose rate range (at Cs): 1µSv/h –... -
Page 154: 10 Function Check
CoMo user´s manual 10 Function check A simple function check should be performed every workday. Since the CoMo also measures the natural radiation, which is always present, a simple function check is possible without ad- ditional tools. A simple function check should be done once per working day. To check, select nuclide 4: α... -
Page 155: 11 External Detectors
CoMo user´s manual 11 External detectors It is possible to connect external dose rate probes to the CoMo 170. The following probes can be connected by an optionally available probe cable: 11.1 Dose rate probes γ- Low dose probe NaI 25B38 11.1.1 Type of radiation: for gamma measurement (DC-installations) -
Page 156: Γ- Low Dose Probe 18 550 Ce
CoMo user´s manual γ- Low dose probe 18 550 CE 11.1.2 Type of radiation: for gamma and x-ray measurement (DC- installations) Calibration: using gamma radiation, Cs 137 Measuring size: photon-equivalent dose rate * Nominal working range of the photon energy: 40 keV-1.3 MeV, Optimum direction: radial radiation onto the probe body;... -
Page 157: Γ- Dose Rate Probe 18 509 Ce
CoMo user´s manual * After effect: negligible with exposure to 100 times the final reading Housing: aluminium housing, bronze anodised, protec- tion class IP 67 Dimensions: 40 mm Ø x 110 mm Weight: approx. 150 g * These values have been checked by the PTB (German physi- cal-technical federal institute) as part of the type approval. -
Page 158: Γ- Dose Rate Probe 18 529 Ce
CoMo user´s manual Average life expectancy of the counter tube: 5 x 10 counts = at 10 mSv/h approx. 17500 h Overload capacity: > 50 Sv/h (continuous radiation) *After effect: negligible with exposure to 100 times the final reading. Housing: aluminium housing, silver anodised protection class IP 67 Dimensions:... - Page 159 CoMo user´s manual *Nominal working range of the temperature: operation: - 30 °C till + 60 °C storage: - 40 °C till + 70 °C * Measuring ranges: 500 µSv/h – 9.99 Sv/h Average life expectancy of the counter tube: 5 x 10 counts = at 10mSv/h approx.
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Page 160: 11.2 Count Probes
CoMo user´s manual 11.2 Count probes Low dose probe 18526 D 11.2.1 Detector: ZP 1430, window counter tube window: mica thickness: 1.5 - 2 mg/cm² effective diameter: 27.8 mm effective surface: 6.1 cm² shielding by protection grid: 20 % Background: approx. -
Page 161: Large-Area Plastic-Scintillation Detectors
CoMo user´s manual Large-area plastic-scintillation detec- 11.2.2 tors Detector type: zinc sulphide coated plastic scintillator with magnetically shielded photomultiplier Detector dimensions: size 1: 240 x 140 x 1 mm³ size 2: 290 x 140 x 1 mm³ Coupling: via air - reflector Nominal working range for outside air pressure: 100-1300 hPa, influence negligible Nominal working range of the temperature:... -
Page 162: 12 Foil Replacement And Foil Repair
CoMo user´s manual 12 Foil replacement and foil repair The foil frame is equipped with a double layer of Mylar foil on both sides. In case of small damages, it is sufficient to cover the spot which is not light tight with a small piece of foil. In case of bigger damages it is useful to replace the complete frame. -
Page 163: 12.1 Removal Of The Foil
CoMo user´s manual 12.1 Removal of the foil Remove the 10 counter- The mounting sunk head screws of the screws of the de- detector. tector (middle screws at the small sides of the detector) don’t have to be removed. Hold the screwdriver in such way that no further damage of the foil can be caused by inadvertently... - Page 164 CoMo user´s manual Then frame with cross studs can be re- moved. In case of damage at the edge of the detector, the foam rubber seal should be removed too. In case of bigger damag- es, the complete frame has to be replaced. Warning! The detector under the foil is covered with a...
- Page 165 CoMo user´s manual The detector itself should stay housing. However, if it has been removed, it is very im- portant to be sure that the side covered with powder is positioned up (towards the foil). page 165...
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Page 166: 12.2 Repair Of The Foil
CoMo user´s manual 12.2 Repair of the foil In the next 4 steps is described how to repair a foil. In case of complete replacement of the foil, these steps can be skipped. Search the hole in the foil. Cut a piece of foil with a sharp knife or scissors (on all sides approx. - Page 167 CoMo user´s manual Coat the cut piece of foil with a glue pen (e.g. Pritt, Uhu) on one side. Put the coated piece of foil on the middle of the dam- aged spot and push it slightly. page 167...
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Page 168: 12.3 Assembly Of The Detector
CoMo user´s manual 12.3 Assembly of the detector The assembly of the detector takes place in reverse order and starts with inserting a non compressed seal. (A compressed seal expands after about 2 hours.) Mind that the holes in the foil are above the screw holes. - Page 169 CoMo user´s manual Tighten the screws in the sequence as shown below. Warning! To avoid that the seal gets crushed, the screws should not be tightened too strong. Because of the direct incidence of light which reaches the pho- tomultiplier during the repair, the device shows much too high values at the beginning.
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Page 170: 13 Accessories
CoMo user´s manual 13 Accessories Currently available accessories: 13.1 Additional probes Dose rate probes 13.1.1 γ-low dose rate probe NaI25D38 1”x 1.5” γ-low dose rate probe NaI38D50 1.5”x 2” γ-low dose rate probe 18 550 DE / CE γ-dose rate probe 18 509 DE / CE γ-high dose rate probe 18 529 DE / CE... -
Page 171: Special 2-Channel Count Probes
CoMo user´s manual Special 1-channel count probes 3“ x 3“ x 0.5“ NaI planar probe 4“ x 4“ plastic scintillator The operation of the probes mentioned above is described in chapter 8.4.2. Special 2-channel count probes 13.1.3 25mm Ø α, β/γ end window probe 50mm Ø... - Page 172 CoMo user´s manual 170 cm², α, β/γ flat probe 4 x 170 cm² α, β/γ probe 375 cm² / 450 cm², α, β/γ probe The operation of the probes mentioned above is described in chapter 8.4.3. page 172...
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Page 173: 1-Wire Probes (Intelligent Probes)
CoMo user´s manual 1-Wire probes (intelligent probes) 13.1.4 With 1-wire probes, various data are stored in the probe and are selected automatically by the CoMo. A part of the stored data can be changed through entries in the CoMo and will be stored changed in the probe. - Page 174 CoMo user´s manual Protection cap for CoMo 170 with fiber glass grid and honeycomb grid. This protection cap can be used to better protect the My- lar foil during a measurement (e.g. grass surface). Caution! The efficiency is reduced when using the protection cap.
- Page 175 CoMo user´s manual Wall / table station passive or active with battery charge function, also with shielding Various test sources page 175...
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Page 176: 14 Device Check With Test Source
CoMo user´s manual 14 Device check with test source Unlike the simple function check (see 10) an elaborate detector check can be realised with a test source. The half-life of the test sample Am-241 is 432 years and therefore negligible during measurement. - Page 177 CoMo user´s manual Make a background measure- ment with the device and switch to net measurement in the Quick menu. Change the nuclide selection to the cps mode. Select the alpha or be- ta/gamma mode, depending on the test source. Place the de- vice (The device has to be turned on) on the test source in such way, that both surfaces...
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Page 178: 15 Test Protocol For Test Source
CoMo user´s manual 15 Test protocol for test source Test source: No.: Date: Activity: Am-241: Bq Sr-90: Measure- α-channel Activity βγ-channel Signature ment on [cps] Sr-90 [Bq] [cps] page 178... -
Page 179: 16 Programme Update
CoMo user´s manual 16 Programme update If you turn on the CoMo, the message BT - Loader active is shortly displayed. During this, the CoMo checks if a PC is con- nected to the serial interface and an update programme was started on the PC. -
Page 180: 17 Ec-Attestation Of Conformity
Restriction of the use of certain hazardous substances in electrical and electronic equipment [RoHS II] Directive 2011/65/EU (06.2011) This statement is made with responsibility for the manufacturer MED Nuklear-Medizintechnik Dresden GmbH Dornblüthstr. 14 A 01 277 Dresden GERMANY Dresden, August 20... -
Page 181: 18 Concluding Remark
We are hap- py to help you if you encounter problems in working with this in- strument. Please send a letter, fax or mail to: MED Nuklear-Medizintechnik Dresden GmbH Subsidiary Dülmen Ostdamm 139 48249 D Ü...
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