Title: DETERMINATION OF THE HALF-LIVES OF Pm$sup 143$ AND Pm$sup 14$$sup 4$
Abstract: The half lives of Pm/sup 143/ and Pm /sup 144/ were determined as 267 plus or minus 15 day and 349 plus or minus 16 day, respectively. Promethium143 was produced by an ( alpha 2n) reaction on Pr/sup 141/, and Pm/sup 144/ was produced by a (p,n) reaction on enriched Nd/sup 144/ (95.7%). Irradiation conditions were selected that would minimize the formation of other promethium isotopes. The decay of Pm/sup 143/ was followed on gamma-ray counters and that of Pm/sup 144/ on gamma-ray and beta-ray counters. The energies of the gamma rays emitted during the decay of these isotopes were determined from gamma-ray pulse-height distribution curves and were in agreement with the published data. (auth)
Publication Year: 1963
Publication Date: 1963-09-30
Language: en
Type: article
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