Add time:07/13/2019         Source:sciencedirect.com

Promethium-148 has been produced by two methods: (1) (n, γ) reaction on Pm-147, (2) (p, n) reaction on enriched Nd-148. In both instances two activities were observed: 5.4d Pm-148 and 41.8d Pm-148. The decay of these isomers has been followed by use of ion-chambers, betacounters, and gamma scintillation spectrometers. Gamma rays of 0.550, 0.910 and 1.460 MeV were found to be associated with the 5.4d isomer with abundances of 0.25, 0.13 and 0.20 respectively. A negaton of 2.5 MeV is associated with the 5.4d isomer with an abundance of approximately 55%. Gamma rays of 0.085, 0.180, 0.210, 0.290, 0.410, 0.550, 0.630, 0.730, 0.910, 1.01 and 1.46 MeV were found to be associated with the 41.8d isomer with relative abundances of 2, 6, 2, 14, 21, 100, 83, 38, 21, 21 and 2 respectively.

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