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NATURAL RADIOACTIVITY OF LEAD-204 AND THE QUESTION OF A NATURAL ACTIVITY OF DYSPROSIUM-156

Wolfgang Riezler, G. Kauw

Abstract

A nuclear emulsion was impregnated with lead enriched to 27.0% with Pb/ sup 207/. The track distributions were determined, and a half life of T = 1.4 x 10/sup 17/ yr was obtained for Pb/sup 204/. The energy of the alpha particles was measured as E = 2.6 Mev. Similar measurements made with a dysprosium sample containing 13.8% Dy/sup 156/ gave a half life greater than 10/sup 18/ yr and an alpha energy of E= 2.2 Mev. It was possible that the tracks were caused by a samarium impurity. (J.S.R.)

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Key concepts: Dysprosium, Samarium, Radiochemistry, Alpha particle, Alpha decay, Impurity, Natural radioactivity, Half-life