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RE: Alpha rules of thumb



You are certainly in the ballpark on these. As mentioned previously, a
lot depends on detection method, detector size and detection efficiency.
Section 6.7.2.2 and Appendix J of the recently mentioned MARSSIM
addresses scanning alpha surveys. Regarding the use of an integrating
mode, I'd treat this as a counting statistics problem rather than use
the methodology mentioned in MARSSIM. 

Rick Edwards, Analyst
The Boeing Company; Radiation Health Protection
richard.w.edwards@boeing.com