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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Instructor's Guide
Lesson Plan
Instructor's Notes
5. The assigned instrument/detector efficiencies
should reflect a prior evaluation of facility
wastes.
Typical efficiencies for a thin-window G-M
probe.
o
C-14, S-35 - 10%.
o
P-32 - 50%.
Results: If surveys indicate
B.
Beta/Gamma Direct Monitoring
presence of contamination (refer
1. Window: Use a thin-window probe, detector
to 10 CFR 835 Appendix D for
window thickness (mylar) should not be more
than 2.0 mg/cm2.
release from controlled areas or
DOE 5400.5 for unrestricted
release), the material should not
2. Scanning: Scan the surface; in most cases,
be released. Prior to release,
scanning will cover nearly 100 percent of
contamination levels must be
accessible surfaces.
less than appropriate values and
should be reduced as low as
3. Distance: Maintain detector window no more
reasonably achievable.
than inch from surface.
4. Speed: The number of counts produced in the
detector is inversely proportional to the
scanning speed.
5. Audio: If at any point a perceivable audible or
visual response is detected, perform a stationary
evaluation of count rate.
D-2
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