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Re: Minimum Detectable Activity



There is a very simple derivation of this in the Procedures Manual of the US
DOE's Environmental Measurements Laboratory (HASL-300). I'd be glad to fax
you the relevant pages; they include a brief bibliography. I don't think that
you really need the +3, unless you have a very small number of counts. A more
lengthy treatment is in the draft ANSI standard on bioassay, which I believe
was withdrawn.

Chris Alston