Abstract

A procedure first described by O. Hahn in 1935 has been adapted to the measurement of the probability of escape of radon and thoron//the “emanation fraction”/ in soils and rocks through application of the germanium counter. Measurement of the regrowth of the214Pb, Bi,212Pb, Bi and208Tl following emanation loss permits the simultaneous determination of the two emanation fractions.

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