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Related Manuals for SARAD MyRIAM
Summary of Contents for SARAD MyRIAM
- Page 1 MyRIAM - 1 - User Manual MyRIAM Version 04/2008 SARAD GmbH Tel.: ++49 (0)351 / 6580712 Wiesbadener Straße 10 FAX: ++49 (0)351 / 6580718 D-01159 Dresden e-mail: support@sarad.de GERMANY internet: www.sarad.de Manual_Myriam_EN_10-04-08.doc (c) SARAD GmbH...
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Page 2: Table Of Contents
MyRIAM - 2 - Content MyRIAM ..........................3 How to apply the Myriam....................3 Theory of operation......................3 Instrument control ......................5 Starting and stopping a measurement ................5 Display of the results ...................... 5 Alert situations........................ 6 Gamma interference, high count rates and shock rejection ..........6 Data transfer ........................ -
Page 3: Myriam
- 3 - MyRIAM The Myriam (My Radioactivity In Air Monitor) is a personal dosimeter to determine dose obtained by long living radioactive dust (LLRD) within the breathed air. Both, alpha and beta radiation will be detected simultaneously. The instrument was designed to warn persons... - Page 4 Beside the online observation of the person an exact dose calculation can be performed by a subsequent filter analysis. The Myriam offers a special operation mode where the pump remains switched off during the measurement. The influence of the Radon daughters will become negligible and the detection limit may decreased as required by increasing the measurement period.
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Page 5: Instrument Control
The measurement can be stopped either by software or (if the button is unlocked) by pressing the button for at least five Seconds. If the Myriam is turned on again the data can be read via the infrared interface. Pressing the button for a second time will start a new sample and the old data are lost. -
Page 6: Alert Situations
Gamma interference, high count rates and shock rejection The detector of the MyRIAM is unable to distinguish between conversion electrons generated by Gamma radiation and electrons emitted by the collected aerosols. That means, in case of high Gamma exposures, a beta inhalation dose is displayed without a true contribution of the filter activity. -
Page 7: Data Transfer
If the instrument is not in use for a longer period, the batteries have to be discharged and recharged each 2 to 3 month. The Myriam must not be charged during a sample with running pump. The charging during a filter analysis is possible. Please note that the charger is no continuous power supply. -
Page 8: Filter Replacement
MyRIAM - 8 - power from its output. To force another recharging the connector to the Myriam has to be removed and inserted again. Filter replacement Important note: Use only filters of the specified type. The filter material affects directly the quality of the alpha spectroscopy. -
Page 9: Technical Data
Instrument display max. 999/9999 cpm (Alpha/Beta) Dose value displayed only for less than 50000 cpm Detection Limits/Thresholds refer following text Software Instrument-setup, data download, graphic display of acquired data (exposure, dose, concentration), ASCII Export (EXCEL compatible text file) Manual_Myriam_EN_10-04-08.doc (c) SARAD GmbH... -
Page 10: Detection Thresholds And Detection Limits
H = e(50) * Breathing Rate * Exposure. Independent on the set integration interval, a one Minute basic interval is applied to analyse the filter with respect to dangerous exposures: Fig. 1 Detection Limit/Threshold (3) for T = 1 min Manual_Myriam_EN_10-04-08.doc (c) SARAD GmbH... - Page 11 Exposure Dose (Sr-90) Analysis Period [Bqh/m³] [mSv] [Bqh/m³] [mSv] 8 hours 0,083 0,0036 0,083 0,000012 12 hours 0,056 0,0024 0,056 0,000008 24 hours 0,028 0,0012 0,028 0,000004 Tab. 1 Detection Limits (3) for filter analysis mode Manual_Myriam_EN_10-04-08.doc (c) SARAD GmbH...
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Page 12: Software
Connecting the Myriam The Myriam communicates with the PC via an infrared data link. The data link unit has to be connected to any USB port of the PC by the cable included in the delivery. When connecting the unit for the first time, the Windows system detects the “new hardware” and starts the installation assistant. -
Page 13: Accessing The Instrument (Panel „Control")
However, it is necessary to stop the measurement if the parameter shall be changed. Switches off the Myriam. To switch on the instrument again the push button has to be used. It is not possible to switch on the unit by software Manual_Myriam_EN_10-04-08.doc... -
Page 14: Set-Up
The set-up dialog allows the user to select the different operation modes and to change the parameters required for online dose calculation. If the dialog is opened by the SETUP button of the main window, all actual parameters are read from the Myriam (if accessible) and will appear inside the edit lines. - Page 15 MyRIAM - 15 - 100 is necessary to get the result as a percentage. In practice the Myriam beta sensitivity will be calibrated by a test source which gives the correct value for the used nuclide. The “Sample Interval” defines the integration interval for the measurement. After completion of each sequential interval a data record will be stored into the internal data logger.
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Page 16: Data Handling (Panel „Data")
The data subdirectory will be created in the same folder where the program file “Myriam.exe” has been installed. The “DATA” directory contains subdirectories assigned to each used User ID. (e.g. -
Page 17: The „Results" Panel
In case that the data have been acquired using the operation mode “Filter Analysis”, it is not possible to select the concentration distribution because there is no defined relation to the pumping time used for the activity collection. The curves for exposure and dose will show a continuously decreasing error. Manual_Myriam_EN_10-04-08.doc (c) SARAD GmbH... - Page 18 MyRIAM - 18 - Manual_Myriam_EN_10-04-08.doc (c) SARAD GmbH...