Abstract
A simple procedure is described for preparing 10-g samples of bone ash for measurement of 226Ra by the 222Rn emanation technique. In this case, the radon is measured in 2-litre ion chambers, but scintillation chambers could be used. Coprecipitation of 226Ra with BaSO 4 gives separation from bulk constituents, and the final precipitate is soluble in a few ml of 30% EDTA. Chemical recovery is measured with 133Ba tracer.
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