Decay of the 3.5-min Metastable State ofSb122

Abstract
The radiations associated with the 3.5-min activity of Sb122 have been studied with 180° magnetic photographic spectrometers and a ten-channel coincidence scintillation spectrometer. Two gamma rays with energies of 60.7 and 75.3 kev were detected by means of internal conversion electrons and also by means of the scintillation spectrometer. The 75.3-kev transition is the more strongly converted of the two, and it is concluded that it is the isomeric transition. The two gamma rays are emitted in cascade.