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LABORATORY SURVEY PROGRAM FORMS WITH GUIDELINES
Guidelines for Completion of Laboratory Survey Report
This page is designed for use as a weekly reminder/checklist. It may be posted or retained with the individual survey reports. Multiple sheets should be used if multiple laboratories are surveyed.
Explanation of each column:
"Week beginning": The Sunday date is shown
"Survey Date": Record the actual date each survey is done.
"Material Used": Indicate with check mark whether radioactive material was used that week
"Meter Survey": Indicate with check mark whether a meter survey was done that week
"Wipe survey": Indicate with check mark whether a smear survey was done that week
"Init": Initials of the individual completing this page
"RSO Audit": To be filled out by representatives of the Radiation Safety Office
2. Preparing a master Laboratory Survey Report form for a specific laboratory
The following items may be filled in before duplication for weekly use:
Location Auth User name Room layout diagram (Note you may not wish to number items until the survey is actually performed) Survey meter used (if same each week) Efficiency for above Scintillation/gamma counter used (if same each week) Efficiency for above
DO NOT SIGN THE MASTER FORM IN THE "SURVEYED BY" LINE--Each survey should be signed at the time it is performed.
3. Efficiency of counting instruments
Table 1 shows acceptable efficiency factors for specific radionuclides. You may use these factors, or determine your own.
1 Specific efficiency data may be determined for the specific instruments and nuclides in use in a particular laboratory. That information may be used on survey records.
2 Efficiency may be reduced if the emission rate from a particular radionuclide is less than 100%.
4. Use of scintillation or gamma counters
Pay particular attention to the counting program used. Verify that the program you use actually has the energy ranges set for the radionuclide(s) that you use. Each time you use the counter, verify that the program has not been changed (Look at counting time, window settings (energy range) selected, efficiency factors applied). IF PRINTOUTS ARE IN "DPM", you may attach them to the survey report. Otherwise, convert the "CPM" readings to dpm and record on the survey form.
5. Conversion of CPM to DPM
Contamination should be reported in units of activity (DPM). This is different than CPM which is the number of electronic pulses recorded by the instrument. The conversion factor is a function of the type of detector, the counting configuration, and other factors. Refer to the Training Manual, Section VI D for an explanation of how to perform this conversion.
An example of this calculation follows:
Assume one minute counts Background counts = 55 Sample counts = 470 Efficiency = .15 Net DPM = (Sample counts - Background counts)/Efficiency = (470-55)/.15 = 2767 dpm At this level, decontamination is recommended.
LAB SURVEY REPORT LOCATION: AUTH.
DECONTAMINATION AND RESURVEY REQUIRED IF LEVELS EXCEED: Radiation equipment: 2200 dpm removable contamination All other areas: 220 dpm removable contamination Clean & red bag trash: No detectable meter readings SURVEYED BY: _____________________________ DATE: ______________
RETAIN THIS RECORD FOR RSO INSPECTION
LABORATORY CALENDAR LOCATED HERE.
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Radiation Safety Office Webmaster Revised February 14, 2006 |
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