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DOE-HDBK-1106-97
VI.
MONITORING FOR CONTAMINATION
While handling unsealed radioactive materials, you should monitor your hands frequently as you
work. Monitor your hands, feet, sleeves, and lab coat when leaving the work station or laboratory.
It is common to find contamination on the lab coat where you may be leaning against your work
station.
A.
Contamination Monitoring Equipment
Always use radiation survey meters. Tritium and certain other isotopes, such as C-14,
cannot be detected with a thin-window G-M survey instrument. For these isotopes, wipe
tests, which are counted in a liquid scintillation counter, are required.
EO11 IDENTIFY the purpose and use of personnel contamination monitors.
1.
Purpose
Contamination-monitoring equipment is used to detect radioactive contamination of
personnel and work areas.
2.
Selection of proper survey instrument
Most hand-held survey instruments are calibrated to a Cesium-137 source.
Correction factors for the specific radionuclide being monitored should be known
when surveying. Often the survey instrument will over or under respond when
monitoring for beta or alpha radiation.
3.
Pre-operational Checks
Perform pre-operational checks before work:
o
Confirm calibration is current.
o
Verify that battery is OK.
30


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