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BERTHOLD TECHNOLOGIES LB 124 Scint Series Manual

Digital contamination monitor
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LB 124 Scint
Digital
Contamination
Monitor
ID No.: 43727BA2
Rev. No.: 06 09.04.08

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Summary of Contents for BERTHOLD TECHNOLOGIES LB 124 Scint Series

  • Page 1 LB 124 Scint Digital Contamination Monitor ID No.: 43727BA2 Rev. No.: 06 09.04.08...

  • Page 3: Table Of Contents

    LB 124 Scint Contents Contents HOW TO WORK WITH THIS MANUAL..............III SAFETY INSTRUCTIONS..................IV THE PRINCIPLE OF OPERATION OF THE LB 124 SCINT ......1 Overview ......................1 The Principle of Operation of Scintillation Counters ........2 What’s Being Measured?................3 Measurement Modes ..................5 SYSTEM DESCRIPTION................7 Housing with Electronic System..............7 Operating and Display Elements ..............9...
  • Page 4 Contents LB 124 Scint SOFTWARE FUNCTIONS ................39 Measurement ....................41 Background ....................44 Measurement Mode ..................48 Measurement Parameters ................49 6.4.1 Ratemeter .....................49 6.4.2 Scaler-Timer....................50 6.4.3 Survey ......................52 6.4.4 Clearance......................53 6.4.5 Half-life ......................54 Cycles......................56 Nuclides ......................58 Memory ......................62 Parameters....................64 6.8.1 Language ......................64 6.8.2 Date/Time......................64 6.8.3 Radiationmode ....................65...

  • Page 5: How To Work With This Manual

    LB 124 Scint How to Work with this Manual How to Work with this Manual A brief overview of the structure of the present operating manual will help you to find the pertinent information quickly and easily: provides basic information on the principle of operation of the digi- Chapter 1 tal contamination monitor: How does a scintillation counter work? What is the significance of the units cps and Bq/cm²?

  • Page 6: Safety Instructions

    Safety Instructions LB 124 Scint Safety instructions The digital contamination monitor LB 124 Scint can be widely Use and function and flexibly used for contamination measurements in radiation protection. It is used wherever contamination caused by radioactive sub- stances is encountered and has to be monitored: in medical nuclide laboratories, in nuclear research, in nuclear power plants, as well as the environment in general.

  • Page 7: The Principle Of Operation Of The Lb 124 Scint

    LB 124 Scint 1. The Principle of Operation of the LB 124 Scint The Principle of Operation of the LB 124 Scint 1.1 Overview The portable contamination monitor LB 124 Scint is used for de- tecting and measuring radioactive alpha, beta and gamma con- tamination on various surfaces such as floors, walls, desks, ob- jects, clothes or the skin.

  • Page 8: The Principle Of Operation Of Scintillation Counters

    1. The Principle of Operation of the LB 124 Scint LB 124 Scint 1.2 The Principle of Operation of Scintillation Counters With conventional scintillation counters the radiation to be measured hits one or several scintillator layers. The flashes of light which are created in this process are propagated – either directly, or bundled by a suitable reflector –...

  • Page 9: What's Being Measured

    LB 124 Scint 1. The Principle of Operation of the LB 124 Scint 1.3 What’s Being Measured? a) Counts per second (cps) The Contamination Monitor is used to measure the radiation ac- tivity on the surface of persons or objects in counts per second. With this measuring method, all alpha, beta and gamma counts are then counted and displayed every second (cps).
  • Page 10 1. The Principle of Operation of the LB 124 Scint LB 124 Scint When you select the unit Bq/cm and the respective nuclide, the LB 124 Scint automatically converts the cps measured into Bq/cm . To measure the area activity, the software comprises an (editable) nuclide library containing at present approx.

  • Page 11: Measurement Modes

    LB 124 Scint 1. The Principle of Operation of the LB 124 Scint 1.4 Measurement Modes The LB 124 Scint offers the following measurement modes: a) Survey mode for fast detection of contaminations. In this mode the instrument reacts very sensitive to different types of radiation activities and shows changes very quickly.
  • Page 12 1. The Principle of Operation of the LB 124 Scint LB 124 Scint Range of application of the ratemeter, scaler-timer and survey modes Measurements in the operating modes "Survey" and "Rateme- ter" are used to detect contaminations. In this mode, every change in the radiation field is quickly indicated.

  • Page 13: System Description

    LB 124 Scint 2. System Description System Description 2.1 Housing with Electronic System The splash-proof housing accommodates the measuring and control electronics, the software and the operating elements of the monitor (see Figure 1). RS232 Interface Connection for power supply unit Figure 1: LB 124 Scint The complete electronic system with photomultiplier (incl.
  • Page 14 2. System Description LB 124 Scint The connections for the power supply unit and the Connections PC/printer (RS232 interface) are located on the right side of the device. The device can be operated either with the help of a power Operating voltage supply unit, with rechargeable batteries (baby 1.2 V), or with batteries (baby 1.5V) located on the bottom side of the device...

  • Page 15: Operating And Display Elements

    LB 124 Scint 2. System Description 2.2 Operating and Display Elements Measurement, operation and display are controlled by the soft- ware integrated in the LB 124 Scint. Measured values, menus and user information are displayed on a monochrome LCD graphics module (192 x 64 pixel) with LED backlighting and a scratch resistant Plexiglas screen.

  • Page 16: Function Keys

    2. System Description LB 124 Scint Bottom line (black shading): Here the menus or functions are displayed that can be selected via the keys under the display (so-called softkey functions. Softkey functions). On the Measurement Menu, the four func- tion keys in the center have the significance that is assigned to them via the softkeys above.

  • Page 17: Scintillation Counter

    LB 124 Scint 2. System Description for rechargeable batteries, the running time left is max. 2-4 hours! In this case, the batteries have to be replaced. 2.3 Scintillation Counter The scintillator is deposited on a transparent carrier. The foil is stretched over a frame and protected by a metal grid.

  • Page 18: Power Supply

    2. System Description LB 124 Scint 2.4 Power Supply 2.4.1 Batteries The fixing screw of the battery case cover can be unscrewed using a coin, so that the cover can be taken off. Figure 4: Open battery case The device can be run with 3 batteries (baby 1.5V). Using batteries To ensure the correct arrangement of the batteries, their re- spective polarities are indicated at the bottom of the battery...

  • Page 19: Rechargeable Batteries And Power Supply Unit

    LB 124 Scint 2. System Description 2.4.2 Rechargeable Batteries and Power Supply Unit When an accumulator is used for the power supply, the option Accu on the menu Parameter/Power Supply has to be se- lected. With this option, the Charge Function is activated when the charging mode is set to ON.

  • Page 20: Data Interface

    2. System Description LB 124 Scint 2.5 Data Interface Data is output to a PC or printer via the RS 232 data interface (see Figure 1). Software for Data transfer between the LB 124 Scint and a PC is at present data transfer to PC only possible in one direction, i.e.

  • Page 21: Getting Started

    LB 124 Scint 3. Getting Started Getting Started 3.1 Connecting the Device Carefully unpack the device. Connect the device to the power supply. It can be run with batteries (baby 1.5 V, ID08932) or rechargeable batteries (baby 1.2 V, ID38396), or using a power supply unit (ID36116): (a) Battery compartment Battery operation: Unscrew the fixing screw of the battery...

  • Page 22: The First Control Measurement

    3. Getting Started LB 124 Scint Please note: After each start-up, the device is in the same pro- file it was in before being switched off. If required, select your own profile from the profile menu. See chapter 6.9. 3.2 The First Control Measurement Turn on the device by pressing the ON/OFF button.
  • Page 23 LB 124 Scint 3. Getting Started Carry out a Background Measurement. The background is subtracted from each measurement. This value should correspond with your ambience conditions and should be checked and updated regularly (at least once a week). See chapters 5.1.2 and 6.2. Battery operation: Set the System Timeout (automatic switch-off when the device is not used).

  • Page 24: Possible Errors During Start-Up

    3. Getting Started LB 124 Scint 3.4 Possible Errors During Start-Up The following errors or error messages may be encountered during start-up Error (message) Error cause / trouble-shooting No reading on display The batteries are dead. Replace them. No power supply present. Check connection cable. Nominal count rate of test source Check detector for tightness is not reached...

  • Page 25: Software Design And Operation

    LB 124 Scint 4. Software Design and Operation Software Design and Operation 4.1 Software Structure The software of the LB 124 Scint has a menu-based user inter- System menu face. All functions (parameter definition, measurement etc.) are selected from the System Menu (see Figure 6). Figure 6: System menu Menu or option names with several periods (…) at the end indi- cate that there is another display linked to it.

  • Page 26: Measurement Menu Display

    4. Software Design and Operation LB 124 Scint 4.2 Measurement Menu Display The type of radiation which has been set when quitting the Measurement menu is displayed first. Then you can choose if both types of radiation are to be displayed at the same time or which type of radiation (measurement channel) is to appear as main display.
  • Page 27 LB 124 Scint 4. Software Design and Operation Repeatedly pushing this button for a short time shows addi- Info/Mod tional information on the on-going measurement. Even after completion of the measurement, further information can still be viewed if you are working with scaler-timer, clearance and background measurements).

  • Page 28: Key Functions

    4. Software Design and Operation LB 124 Scint 4.3 Key Functions If you push a button for a longer time, a clock symbol appears in the upper left corner of the display. You may release the but- ton as soon as the symbol appears. The software is operated by means of the 4 push buttons in the center below the display.

  • Page 29: Softkeys

    LB 124 Scint 4. Software Design and Operation 4.3.2 Softkeys On the Measurement Menu, the software is controlled with the help of so-called softkeys. Softkeys are software-controlled key designations on the display, which assign the current functions to the push keys. They are displayed in the bottom line. Line with softkeys Softkey buttons Figure 8: The items Nuclide, Store, Menu and Info/Mod are...

  • Page 30: Operation

    4. Software Design and Operation LB 124 Scint 4.4 Operation 4.4.1 Selecting Menus and Options Move the cursor ( ) on the System Menu to the desired menu or option by pressing the key, then press . The re- spective menu item is activated and the corresponding page is displayed.

  • Page 31: Selecting Items From A List

    LB 124 Scint 4. Software Design and Operation 4.4.3 Selecting Items from a List Proceed as follows if you can only select predefined values or categories from a list: Mark the parameter using the cursor. Press the key. The edit mode is activated. By repeat- edly pressing , the available options are displayed one by one.

  • Page 32: How To Switch To The System Menu

    4. Software Design and Operation LB 124 Scint 4.4.4 How to Switch to the System Menu? After power on When the device has been switched on, it goes automati- cally into the measurement mode, which was set when switching off the device (Measurement Menu). In the ratemeter mode: Choose the option Menu by pressing key.

  • Page 33: Contamination Measurements

    LB 124 Scint 5. Contamination Measurements Contamination Measurements You can start with the contamination measurements immedi- ately after the initial start-up of the device. When it is turned on, the device immediately starts measuring and displays the re- sults according to the preset nuclide and measurement mode or the background measurement (in case of preselected autostart function) Explanations concerning the setting of the parameters and the...

  • Page 34: Contamination Measurement Requirements

    5. Contamination Measurements LB 124 Scint 5.1 Contamination Measurement Requirements 5.1.1 Performance Check Turn on the device and make sure that the battery capacity is sufficient. Warning signals: When, after switching on the device, the battery/ accumula- tor voltage display is below 3V for batteries or 3.5 V for re- chargeable batteries, the running time left amounts to a maximum of 2-4 hours! In this case, replace the battery before starting the meas-...

  • Page 35: Measuring And Storing The Background

    LB 124 Scint 5. Contamination Measurements 5.1.2 Measuring and Storing the Background The background, i.e. the ambient radiation, is measured in CPS. It is automatically subtracted in the course of the sample measurements. The gross and raw data values can be dis- played simultaneously.
  • Page 36 5. Contamination Measurements LB 124 Scint Start the background measurement by moving the cursor ( ) to Start and pressing the key. Then the back- ground measurement starts. Figure 12: Background measurement On the display, the measured values and the passed meas- uring time are permanently indicated.
  • Page 37 LB 124 Scint 5. Contamination Measurements Automatic Background Measurement When the autostart function is activated, every time the device is switched on, a background measurement with the preset pa- rameters is executed. After the end of the background measurement (measuring time over or stop) the determined value can be stored with the Store , or a new background measurement can be started with Start (...

  • Page 38: Creating The Small Nuclide Table

    5. Contamination Measurements LB 124 Scint 5.1.3 Creating the Small Nuclide Table To be able to select particular nuclides for a sample measure- ment, you first have to select the nuclides from the existing nu- clide table that you use most frequently and that you wish to fetch directly during measurements.
  • Page 39 LB 124 Scint 5. Contamination Measurements Entering alarm thresholds Be cautious if you modify the nuclide parameters! Procedure Move the cursor (->) to the desired nuclide. Press the key for approximately one second. This brings you to the page where you can edit the parame- ters for the respective nuclide (see 4.4.2 and 6.6).
  • Page 40 5. Contamination Measurements LB 124 Scint Each display contains the current measured value, the unit of measurement and, on the left, the selected nuclide or the Net [cps] measurement mode. With each change of the display, the measured value for the new position is displayed practically without time delay.
  • Page 41 LB 124 Scint 5. Contamination Measurements Measuring the Area Activity Start the measurement by selecting the desired measurement mode (Ratemeter, Scaler-Timer ...) on the System Menu, and then Start. • First, set the desired measurement channel (type of radia- tion) by pushing the Info/Mod key (long): Display of the α-, the βγ- or both measurement channels at the same time.

  • Page 42: Explanations Of The Different Measurement Modes

    5. Contamination Measurements LB 124 Scint 5.2 Explanations of the Different Measurement Modes In the following paragraphs, you will learn to choose the correct measurement mode for each situation, and what differences there are between the individual modes: Net [cps] Counts per second In this measurement mode, the net count rate determined by the detector is displayed, on the condition that a background...

  • Page 43: Accuracy Of The Display In Bq/Cm²

    LB 124 Scint 5. Contamination Measurements If you are dealing with a compound of radio nuclides and you know the individual nuclides, you make use of a so-called trac- er; this will either be the nuclide that is the major constituent of the compound, or the most dangerous one (with fresh fission products, this will almost always be iodine-131).

  • Page 44: Exceeding Of Threshold Values

    5. Contamination Measurements LB 124 Scint For measurements according to § 44 of the German Radiation Protection Ordinance the averaging area may be up to 300 cm². The measurement area of the LB124 Scint is 118 mm x 145 mm (171 cm²) at a transmission of 80 %. For contaminations with an extent of less than 100 cm², the av- eraging takes place automatically according to the above- mentioned calibration conditions.

  • Page 45: Software Functions

    LB 124 Scint 6. Software Functions Software Functions You will find a detailed description of the software operation in chapter 4 (how to select the System Menu, how to select menu items, how to edit things etc.). All menu items can be selected from the System Menu. Only those menu items are displayed for which the user has a respective reading or editing authorization.
  • Page 46 6. Software Functions LB 124 Scint Chpt. System menu Options Measurement Start Background α-background/ βγ- background Preset Time α-Precision βγ -Precision Threshold Autostart OFF, ON Ratemeter, Scaler-Timer, Survey, Clearance, Half-life Value Measurement Mode Preset Condition Measuring Time, Counts, Precision Measurement Parame- ters Time Constant...

  • Page 47: Measurement

    LB 124 Scint 6. Software Functions 6.1 Measurement Choose this menu item (or press the ESC key on the System Menu) to go to the Measurement Menu. The measurement will be started automatically in the selected measurement mode with the appropriate parameters set. The active measurement mode is shown in the first row of the display.
  • Page 48 6. Software Functions LB 124 Scint A long push (until the clock symbol appears in the top left Info/Mod corner) changes the measurement channel which appears as main display: βγ-measurement channel both meas- α-measurement channel (see chapter urement channels 4.2) Repeatedly pushing this button for a short time shows the information shows the information of the on-going measurement.
  • Page 49 LB 124 Scint 6. Software Functions In case of simultaneous α-/βγ-measurement, only the cur- rent accuracy for both channels and the date/time are dis- played.

  • Page 50: Background

    6. Software Functions LB 124 Scint 6.2 Background Upon selection of this menu, the following options are dis- played: Figure 22: Background menu with options The currently stored background is subtracted in every meas- urement (in every measurement mode). Starts the background measurement in both measurement Start channels at the same time using the parameters defined on this page.
  • Page 51 LB 124 Scint 6. Software Functions In the background measurement the softkeys have the follow- ing functions: Measurement Mode Status Stop/ Background Store Start/ Menu Info/Mod Stop This softkey is only displayed when the measurement has fin- Store ished. By pressing this key you can store the measured back- ground in the Background menu in the line Current Value.
  • Page 52 6. Software Functions LB 124 Scint To obtain accurate results, the background measurement Measuring period should take at least 60 seconds! The background value should be measured and stored dai- ly and with each change of the ambience, because other- wise you will get false results in the Bq-measurement mode! The stored background value is displayed in the back-...
  • Page 53 LB 124 Scint 6. Software Functions Enter the desired precision for the α and the βγ measurement Precision channel. As soon as the preset accuracy for both channels has been reached, the background measurement will be stopped (even if the preset measurement time has not yet been reached).

  • Page 54: Measurement Mode

    6. Software Functions LB 124 Scint 6.3 Measurement Mode The measurement mode is selected on this menu. This setting refers to the two menus Measurement and Measurement Pa- rameters. The Parameters displayed on the menu Measurement Pa- rameters are valid only for the preset measurement mode. Modifications are also stored depending on the measurement mode.

  • Page 55: Measurement Parameters

    LB 124 Scint 6. Software Functions 6.4 Measurement Parameters 6.4.1 Ratemeter Figure 26: Parameters for ratemeter measurements Here the type of averaging is defined. The alternatives are Preset Condition Meas. Time / Precision. Here you enter the desired time constant, i.e. the time in which Time Constant the averaging algorithm works.

  • Page 56: Scaler-Timer

    6. Software Functions LB 124 Scint 6.4.2 Scaler-Timer Figure 27: Parameters for a Scaler-Timer measurement, depending on the selected preset condition Here you can define the parameter that determines the end of Preset Condition the measuring process: The predefined Measuring Time, the number of Counts or the Precision.
  • Page 57 LB 124 Scint 6. Software Functions For a measuring accuracy with a statistical error of 1%, 10,000 counts have to be entered or, to put it differently, only after 10,000 counts the desired measuring accuracy will be reached. It is apparent from this that low activities will result in long mea- suring periods.

  • Page 58: Survey

    6. Software Functions LB 124 Scint 6.4.3 Survey Figure 28: Parameters for survey mode Enter the desired time constant. Time constant α-Precision βγ- Precision Define the accuracy for the α and the β measurement channel in % which is to be used for measurement. α-nuclide Select the α-nuclide or Net or Gross from the small nuclide ta- ble to enter/show the respective threshold.

  • Page 59: Clearance

    LB 124 Scint 6. Software Functions 6.4.4 Clearance For clearance measurement, a limit value is defined and an alarm signal will be triggered if this value is exceeded. The dis- play shows: (otherwise CONTAMINATED CONTAMINATED). Push the Info softkey to view the channel that is contaminated.

  • Page 60: Half-Life

    6. Software Functions LB 124 Scint 6.4.5 Half-life This type of measurement is selected to determine nuclides in unknown radiation substances. Several measurements will be carried out (the number of mea- surements has to be set on the Cycles menu) and these meas- urements are used by the program to calculate the half-life pe- riod.
  • Page 61 LB 124 Scint 6. Software Functions Half-life measurement procedure • A net measurement is started when you go to the measure- ment menu with the measurement mode "Half-life period" preset. • As soon as the preset accuracy for both measuring channels is reached, the half-life measurement starts and the counts per second are displayed.

  • Page 62: Cycles

    6. Software Functions LB 124 Scint 6.5 Cycles The cycle parameters for all measurement modes are defined on this menu: Here you define whether the measurement is to take place only once (“Single“) the measurement is to be carried out repeatedly (“For- ever“) a predefined number of measuring cycles is to be executed (“Increment“).
  • Page 63 LB 124 Scint 6. Software Functions Enter the desired number of cycles. b) Increment Figure 34: Cycles menu - Increment setting Cycle time, depending on the measurement mode: Cycle time In case of scaler-timer, clearance and half-life measurements the cycle time corresponds to the measurement time. It is taken from the measurement settings of the respective measurement mode.

  • Page 64: Nuclides

    6. Software Functions LB 124 Scint 6.6 Nuclides Display of the nuclide table with edit function. When you select this menu option, the first 7 nuclides of the nu- clide table are displayed. The cursor is located at the top posi- tion of the table.
  • Page 65 LB 124 Scint 6. Software Functions Figure 36: Nuclide table...
  • Page 66 6. Software Functions LB 124 Scint Please be careful when editing the nuclide table. Only the pa- Editing the nuclide table rameters of the positions "β-Tot", "B-1", "B-2" and Net [cps] should be modified, if required. For all other nuclides, the cali- bration factors have already been correctly determined and set by the manufacturer.
  • Page 67 LB 124 Scint 6. Software Functions Under the Radiation Protection Act of May 27, 1989, the follow- Limit values ing limit values apply to contaminations caused by beta and gamma radiation sources. The same applies to Alpha sources. Examples four outside the monitoring area in Bq/cm²: 201: When the limit value is exceeded, measures have to be taken immediately to avoid the spreading of contamination.

  • Page 68: Memory

    6. Software Functions LB 124 Scint 6.7 Memory With this menu item the memory contents can be shown on the display or output via the RS232 interface. The measured values are stored either by pushing the respective softkey or via the automatic storage function (see menu Cycles/Autostore in chapter 6.5) When saving the measurement, the number under which the...
  • Page 69 LB 124 Scint 6. Software Functions Erase Memory Erases the entire memory contents! Show memory First, you carry out a scaler-timer measurement with 3 cycles, Example then a ratemeter measurement, where you store 2 measure- ments, and then again a scaler-timer measurement with one cycle.

  • Page 70: Parameters

    6. Software Functions LB 124 Scint 6.8 Parameters The following system parameters are set on the this menu: Figure 41: Parameters menu 6.8.1 Language You can choose between German and English as language for the user surface. 6.8.2 Date/Time Here the date and the time are checked and set. This informa- tion is used for the storing of measured values and for half-life value measurements.

  • Page 71: Radiationmode

    LB 124 Scint 6. Software Functions 6.8.3 Radiationmode The radiationmode can limit the display and sounding of the ticks (selection of α or βγ). If α/βγ is chosen, switching between the radiation modes α and βγ is still possible, in this case the ticks of both channels can be heared, if activated in the menu parameter Ticks.
  • Page 72 6. Software Functions LB 124 Scint nuclide library, the thresholds can be edited on the Measure- ment Parameters menu (see chapter 6.4).

  • Page 73: Ticks

    LB 124 Scint 6. Software Functions 6.8.7 Ticks Here you can set the measurement channel (type of radiation) in which the acoustic ticks should be audible. Figure 45: Selection of measurement channel for acoustic alarm 6.8.8 Light Here you can choose the light intensity for the display: light, middle and dark can be selected.

  • Page 74: Rs232

    6. Software Functions LB 124 Scint 6.8.9 RS232 Data transmission via the RS232 interface is only possible, when the function Autoprint or Autostore on the Cycles menu is active (ON): Figure 47: Parameters for the RS232 interface Remote access can be turned ON or OFF using a terminal pro- Remote access gram for remote control for F²C communication.

  • Page 75: Hardware

    LB 124 Scint 6. Software Functions Note: If the device is placed into the wall holder or if it is turned on, the rechargeable batteries inside the device can be charged au- tomatically, provided the Charge mode is set to ON. Via the menu item Charge time the duration of the charging process is limited to max.

  • Page 76: Profile

    6. Software Functions LB 124 Scint 6.9 Profile 6.9.1 Overview The access rights for different user (groups) can be defined on this menu. For each user, only the menu items will appear which he is allowed to work with (read and/or edit). At most 4 profiles are possible.

  • Page 77: Editing Profiles

    LB 124 Scint 6. Software Functions 6.9.2 Editing Profiles Profiles can be modified only by a user having the appropriate PIN number. The access rights (read/edit/no authorization) can be defined for each individual menu item. When setting the profiles the following symbols are used: R = authorization to read W = authorization to edit ,_, = no authorization...
  • Page 78 6. Software Functions LB 124 Scint Figure 53: System menu On the System Menu, mark the menu item whose authori- zation status you want to change with the cursor ( ). Figure 54: System menu – allocating rights Select the desired authorization status by pressing repeatedly.

  • Page 79: Preset Profiles

    LB 124 Scint 6. Software Functions To quit the profile editing mode, select the Profile menu once more and there the item Edit Profile. You will get to the Profile | Edit Profile menu. Select Modify Profile and push the button.

  • Page 80: Transmit/Receive Setup

    6. Software Functions LB 124 Scint 6.9.5 Transmit/Receive Setup This function allows you to transmit all device settings to an- other LB 124 Scint device with the same software version num- ber. An error message appears if both devices have different version numbers and the transmission cannot be started.

  • Page 81: Maintenance

    LB 124 Scint 7. Maintenance Maintenance 7.1 Cleaning the Detector Window The window foil of the detector is susceptible to mechanical damage. Therefore, it is protected by a relatively tight cover and protection grid. Nevertheless, you should avoid everything that could destroy the window foil (pointed objects, measuring stub- ble-fields, rose-hedges or cat’s paws!).

  • Page 82: Changing The Window Foil With Scintillator

    7. Maintenance LB 124 Scint 7.2 Changing the Window Foil with Scintillator A damaged detector window foil can easily be replaced by the user. B supplies a foil stretched over a ERTHOLD ECHNOLOGIES frame as spare part. Procedure Change the foil in a darkened room (semi-darkness), as the photomultiplier and the scintillator will be exposed to light in the course of this process.

  • Page 83: Exchanging The Battery

    LB 124 Scint 7. Maintenance 7.3 Exchanging the Battery The device needs three dry batteries, type C, baby (IEC LR 14, with 1.5 volt each). The serviceable life of a fresh set of high output cells is more than 50 hours of continuous operation (without lighting and without RS232 communication).

  • Page 84: Charging The Rechargeable Batteries

    7. Maintenance LB 124 Scint 7.4 Charging the Rechargeable Batteries Only Ni-MH rechargeable batteries may be used in the LB 124. „Accu“ has to be set as cell type on the Utility/Hardware menu. To charge the rechargeable batteries, connect the basic device to the mains supply (the device will be turned on automatically) and start the charging process on the menu Parameter/Power Supply/Charge Mode.

  • Page 85: Basis Of Calculation

    LB 124 Scint 8. Basis of Calculation Basis of Calculation 8.1 Count Rate Calculation The LB 124 Scint updates the calculation of the raw data in CPS (counts per second) every second, i.e. the succeeding calculations are based upon intervals of 1 second. General Formulas and Designations Measured time [s] Length of one interval (always 1s)

  • Page 86: Ratemeter Function

    8. Basis of Calculation LB 124 Scint The weighting factor W is determined as follows in the rateme- ter function: τ τ with = the number of seconds since the start of averaging. The number of seconds used for the averaging depends on the measurement mode and can therefore determine whether a high accuracy with slower reaction time to changes is obtained, or a faster adaptation to changes involving a lower accuracy.

  • Page 87: Survey Mode

    LB 124 Scint 8. Basis of Calculation Basis of Calculation Ratemeter t < Preset time: t ≥ ∆ ≥ Preset accuracy: ∆ < − > ∆ Reset and calculate new, if Designation Variable Unit Default Parameter Averaging Time (Preset: time, accuracy) Time constant (preset time) Accuracy (preset accuracy) Sigma factor...

  • Page 88: Half-Life Measurement

    8. Basis of Calculation LB 124 Scint 8.4 Half-life Measurement At the start of the measurement, the count rate is average as in the Ratemeter mode. The determination of the half-life period is started once the ac- curacy has been reached. Then a measurement takes place in the Scaler/Timer mode according to the formula: −...

  • Page 89: Bq-Calculation And Determination Of The Calibration Factors

    LB 124 Scint 8. Basis of Calculation 8.6 Bq-Calculation and Determination of the Calibration Factors The explanation of the basic principles of the Becquerel calcu- lation is not only of a documentary nature, but is meant to en- able you to determine calibration factors for contamination mea- surements for further nuclides, which are not part of the nuclide library of the LB 124 Scint.
  • Page 90 8. Basis of Calculation LB 124 Scint...
  • Page 91 LB 124 Scint 8. Basis of Calculation Procedure 1. Choose the CPS measurement mode. 2. Place the hand-held probe upon the calibrating source in such a manner that it covers the source well, in order to loose as little activity as possible. 3.
  • Page 92 8. Basis of Calculation LB 124 Scint List of radionuclides with calibration factors programmed in the LB 124 Scint for conversion from cps to Bq/cm . Test sources have been used for the standardized area 10 cm x 10 cm (A-100).
  • Page 93 LB 124 Scint 8. Basis of Calculation Pm-147 0,25 28,9 12,27 0,082 0,085 0,173 Sm-153 0,50 84,8 72,06 0,014 0,014 0,030 Er-169 0,25 61,4 26,11 0,038 0,039 0,080 Re-186 0,50 68,1 57,88 0,017 0,018 0,036 Re-188 0,50 75,6 64,24 0,016 0,017 0,034 Au-198...
  • Page 94 8. Basis of Calculation LB 124 Scint Ga-67 0,50 12,1 12,08 0,083 0,085 0,175 Se-75 0,50 5,23 0,191 0,197 0,404 Sr-85 0,50 1,59 1,59 0,629 0,648 1,330 Rb-86 0,50 38,2 38,17 0,026 0,027 0,055 Sr-89 0,50 41,9 41,92 0,024 0,025 0,051 Sr-90+ 0,50...

  • Page 95: Technical Data

    LB 124 Scint 9. Technical Data Technical Data Radiation monitor for measuring radioactive contaminations with alpha, Application beta and gamma sources on surfaces. Monochrome LCD graphics module with 192x64 pixels, LED backlighting, Display extended temperature range. Foil keyboard, 6 tactile response keys, 4 softkeys, 1x device on/off, 1x Keyboard tone/LCD-lighting on/off 2 LED’s for alert signal and functional check...
  • Page 96 LB 124 Scint Temperature range operation: -20°C ... +40°C (no condensation) Temperature range ±10% Stability over range: Temperature range storage: -40°C ... +60°C IP53 Protection type >50 000 cps Overrange Indication Sunlight <10 cps Light-proof/Entrance window Close to PC monitor no visible influences External magnetic fields Splash-proof if housing is in upright position.

  • Page 97: Index

    LB 124 Scint 10. Index 10. Index CPS measurement —A— Cycles Acoustic alert —D— Alarm Alarm thresholds Data interface Alerts Data transfer to PC Area activity Date/Time Area activity measurement Determining calibration factors Automatic background measurement Display 9, 20 Automatic printing function Display accuracy Automatic storage function 56, 62...
  • Page 98 10. Index LB 124 Scint —L— BG measurement Half-life measurement Language Ratemeter LCD display Scaler-Timer LCD lighting Preset condition 49, 50 LED displays Preset time LED indicators Principle of operation Light intensity Scintillation Counters Limit values Principle of operation Line voltage Print memory Lithium battery Profile...
  • Page 99 LB 124 Scint 10. Index Software structure Scaler-Timer Spillover Survey mode STANDARD Ticks Profile Time constant Standard accessories Ratemeter Standard equipment Survey mode Survey Transmit setup/ Receive setup Measurement mode Transport box Survey mode Transport protection Basis of calculation Types of radiation Switchover of result display —U—...
  • Page 100 10. Index LB 124 Scint 10-2...

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