Separation of Transplutonium Elements from Neutron Irradiated Americium-241, (II)

The isotopes of transplutonium elements were produced by irradiation of 62 mg of 241AmO2 in JMTR during the period July 1971 through July 1972. The transplutonium elements were separated from plutonium, fission products and cladding materials by a combination of precipitation and ion exchange. Americium, curium, berkelium and californium were mutually isolated by ordinary procedure. The isotopic ratios of americium and curium were determined by mass spectrometry, and berkelium and californium by radiochemical method. In addition to the nuclides detected in the previous work, 246Cm, 249Bk and 249Cf were also identified.