Abstract
For the accuracy improvement of nuclear data of minor actinides and long-lived fission products in the project of “Research and development for Accuracy Improvement of neutron nuclear data on Minor Actinides”, the isotopic compositions of two Am samples (241 Am sample and 243 Am sample) were analyzed by thermal ionization mass spectrometry. Only the peak of 241 Am was observed in the analysis of 241 Am sample, and level of isotopic impurities were improved from 0.1% to 0.0004%. In the analysis of 243 Am sample, the peak of unreported isotope of 242m Am was observed in addition to the peaks of 243 Am and 241 Am. The mass spectrometry also showed that 243 Am sample has other unreported impurities such as 239 Pu and 240 Pu.
Highlights
For the development of innovative nuclear fuel system and nuclear transmutation system, the accuracy improvements of neutron nuclear data for minor actinides (MAs) and long-lived fission products (LLFPs) are indispensable
The objective of our group is to obtain the high quality isotopic composition data of samples contributing to the evaluation of nuclear cross-section measurement data by mass spectrometry etc
The mass spectrum of CRM U010 [7] obtained in this study and the dependency of the analytical error in 235U/238U ratio measurement on the loading amount of U are shown in Figs. 1 and 2
Summary
For the development of innovative nuclear fuel system and nuclear transmutation system, the accuracy improvements of neutron nuclear data for minor actinides (MAs) and long-lived fission products (LLFPs) are indispensable. A nuclear data project entitled as “research and development for Accuracy Improvement of neutron nuclear data on Minor ACtinides (AIMAC)” was launched at 2013 as one of the ”Innovative Nuclear Research and Development Program” [5]. This project consists of four research field groups such as differential nuclear data measurement, integral nuclear data measurement, nuclear chemistry, and nuclear data evaluation. The objective of our group is to obtain the high quality isotopic composition data of samples contributing to the evaluation of nuclear cross-section measurement data by mass spectrometry etc. The isotopic compositions of Am samples were analyzed according to the result of the analysis of U
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