5. The assigned instrument/detector efficiencies should
reflect a prior evaluation of facility wastes.
Typical efficiencies for a thin-window G-M probe.
C-14, S-35 - 10%.
P-32 - 50%.
Results: If surveys indicate
Beta/Gamma Direct Monitoring
presence of contamination
1. Window: Use a thin-window probe, detector window
(refer to 10 CFR 835
thickness (mylar) should not be more than 2.0 mg/cm2.
Appendix D for release from
controlled areas or DOE
2. Scanning: Scan the surface; in most cases, scanning
5400.5, Ch.2, for unrestricted
will cover nearly 100 percent of accessible surfaces.
release), the material should
not be released. Prior to
3. Distance: Maintain detector window no more than inch
release, contamination levels
must be less than appropriate
values and should be reduced
4. Speed: The number of counts produced in the detector
as low as reasonably
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.
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