Disintegration of antimony-124.

The radiations from 60-day Sb lN have been studied by several investigators. H ales and Jordan [2] used a 1800 spectrometer to study the beta spectrum of Sb124. Tbey report the presence of two components with maximum cnergies at 0.74 ± O.03 and 2.45 ± 0.07 million electron volts (NIev) . ~1iller and Omtiss [3], u ing a thin magnetic len spectrometer , also ob erved a complex beta specLrum, but with maximum energies at 0.53 and 2.25 Mev. The most recen.L inve tigation of the beta and gamma radiations is that of Meyerhof and ScharffGoldhaber [1] by means of coincidence-absorption measuremen ts. They r eport the presence of two beta-ray components with energies of 0.7 and 2.4 Mev; and two gamma rays with energies of 0.6 and 1.7 M ev. A table summarizing the results of previous studies of Sb 124 is also given by them. Although the gamma radiations from Sb124 had been studied by a number of investigators prior to these authors, non e of them had reported the presence of a 0 .6-~/Iev gamma ray. "With one exception, these prior reports indicated only one gamma my with energy abo ut 1.7 Mev. The present paper provides further information regarding the origin of this 0.6-Mev gamma ray. The energies of the beta and gamma rays from Sb124 reported here were obtained by means of a spectrometer of the thin magnetic lens type. This instrument has been described by Miller and Ourtiss [4]. The results obtained are in partial