Abstract
The use of a thick-source alpha-particle detection technique for the simultaneous determination of both thorium and uranium in geological samples is discussed. The technique depends on the presence of the “thorium pairs” resulting from the successive decays of thoron and the short-lived isotope thorium A, and has been extensively employed by Mayneord and others in biophysical problems. The absolute accuracy, the sensitivity and the limitations of the method are considered. Finally, thorium and uranium determinations for the granites G—1 and Tory Hill and the diabase W—1 are presented.
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