Beta/Gamma Direct Monitoring
1. Window: Use a thin-window probe, detector window thickness (mylar) should
not be more than 2.0 mg/cm2.
2. Scanning: Scan the surface; in most cases, scanning will cover nearly 100 percent
of accessible surfaces.
3. Distance: Maintain detector window no more than 1/2 inch from surface.
4. Speed: The number of counts produced in the detector is inversely proportional
to the scanning speed. ANSI 13.12 (1987) describes a formula for calculating
5. Audio: If at any point a perceivable audible or visual response is detected,
perform a stationary evaluation of count rate.
Smear Surveys for Releasing Material
1. An initial screening evaluation (not for final release) may be conducted by
wiping 100 percent of surface.
2. These large-area wipes may be evaluated by holding the probe up to the swipe
3. If initial screening evaluation indicates presence of contamination, take
representative disc smears (100 cm2 area) of up to 100 percent of accessible
All surveys for release shall be documented in writing. Documentation of release
from controlled areas should include information required by RCM Article 421.5.
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