A large cylindrical ionization counter accommodating samples up to 1200 cm² in area has been used for measurements of natural alpha radioactivity in medium-heavy elements. Low-background techniques and multichannel pulse analysis are employed. The method has greater energy resolution and yields better counting statistics than the nuclear emulsion technique, but does not have as great a sensitivity.The results obtained from measurements on natural elements and isotopically enriched samples are:
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Macfarlane et al. (1961) studied this question.
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