The radiations of UY have been examined by absorption curve techniques. Among the radiations are: (1) 0.2-Mev beta, (2) $L$ x-rays, (3) 35-kev gamma-ray, (4) soft electronic component, probably conversion electrons about 50 kev, (5) soft quantum component, probably $M$ x-rays, and (6) two harder gamma-rays, 65 to 75 kev and about 100 kev. On abundance and coincidence considerations, a tentative decay scheme is suggested which includes a 0.2-Mev beta followed by 35- and 65-kev gamma-rays in cascade with a 100-kev cross-over transition. The half-life was found to be ${25.6}_4$±0.1 hours.

• Received 10 January 1951

DOI:https://doi.org/10.1103/PhysRev.82.498