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ssbauer Isomer shifts and Structures of Neptunium compoundsSaeki, Masakatsu; Nakada, Masami; Kitazawa, Takafumi*
KURRI-KR-106, p.38 - 42, 2004/03
no abstracts in English
Saeki, Masakatsu
JAERI-Review 2002-040, 23 Pages, 2003/01
JAERI-Review-2002-040.pdf:1.38MB
Professor Krot stayed at Tokai research establishment, Japan Atomic Energy Research Institute for 45 days from Friday on February 28, 1997 to Thursday on January 16, 1997 by an invitation of the Research group for Moessbauer spectroscopy of actinoids, Advanced science research center. In the mean time, Professor Krot left many memoranda on actinoid research for the research group. This is the translated form of those. The contents are various things, that is, “synthesis of neptunium compounds in valence states of 3, 6 and 7", “method for recovery and reuse of neptunium from compounds in a laboratory", “records of the neptunium compounds synthesized during his stay", and so on. Also, the contents of discussions between Professor Krot and mainly the author is summarized in chronological order.
Suzuki, Atsuyuki*; Nagasaki, Shinya*
PNC TJ1602 92-001, 75 Pages, 1992/03
For the safety assessment of high level waste disposal system, it is important to understand the migration behaviors of actinides in the near- or far-field. Although the importance of migration of actinides which form the colloids has been pointed out recently, the migration behaviors of colloids are not fully understood. In this study, the migration behaviors of colloids were investigated experimentally by column method. In the experiments, quartz powder was used as the solid. Ferric hydrous oxide colloids were prepared as the real colloids and neptunium(V) formed Np(V)-Fe(III) pseudocolloids by sorption. Some fractions of the colloids eluted with the eluting solution. Also observed were strongly retarded fractions. Non-negligible fractions were found to migrate faster than the eluting solution. These migration characteristics were qualitatively understood in this work.