[ RadSafe ] Bismuth-212 and 727-keV gammas

McNaughton, Michael mcnaught at lanl.gov
Wed Oct 6 09:25:16 CDT 2010

Dear RadSafers

I have a problem with the gamma-spec results for bismuth-212. The reported concentrations for bismuth-212 are consistently higher than those for Pb-212, as well as for all the other nuclides in the thorium-232 decay chain. This is the case for several types of samples, collected over several years, and analyzed at several different analytical labs.

I suspect the problem is with the emission probability (or "intensity") for the 727-keV gamma. Different publications list different numbers for the emission probability. The numbers range from about 6% to 12%. 

I would like to discuss this problem with others who are interested. 

Thanks, mike
Mike McNaughton
Los Alamos National Lab
mcnaught at lanl.gov

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