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The radioactive sources were obtained from neodymium oxide, enriched in Nd 148 , irradiated in the Argonne reactor CP-5. After the 1.8-hr activity of Nd 149 had decayed away, the 53-hr activity in 6iPni 149 remained. Some of the samples were purified by ion-exchange-column techniques before being studied. The radiations were investigated with a 180° focusing beta-ray spectrometer and the Argonne 256-channel scintillation coincidence spectrometer. The magnetic spectrometer resolved two components of the beta spectrum at 1.064±0.008 and 0.784±0.010 Mev. The beta rays were also studied by coincidence absorption techniques. In addition to the branch with a maximum energy of 0.784db0.010 Mev, this method revealed two more at 0.47±0.04 and 0.19±0.04 Mev. The scintillation pulse-height spectrum of the gamma rays revealed the presence of three transitions at 0.850±0.008, 0.582±0.006, and 0.285±0.001 Mev. A fourth gamma ray with an energy of 0.548±0.006 Mev was found in coincidence measurements. These radiations are fitted into a decay scheme comprising the ground state and four excited states in Sm 149 at 0.285, 0.582, 0.833, and 0.850 Mev. The log-// values, transition intensities, and possible spin and parity assignments are discussed.

Using the separated isotopes of platinum, irradiated in the pile, the energies of the gamma rays for the activities of Pt 191 , Pt 193 , and Pt 195 have been evaluated. For Pt 191 fifteen gamma rays are found which fit well a simple level scheme. Pt 193 emits isomerically a gamma ray followed by K capture to iridium, with the possible emission of a high-energy gamma. Pt 196 emits a highly converted gamma ray followed by two others in rapid succession decaying to the stable isotope. The half-lives of the three activities are found to be 2.90, 3.35, and 6 days, respectively.