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佐々木 祐二; 佐伯 盛久
Proceedings of R'09 Twin World Congress (CD-ROM), 5 Pages, 2009/09
異なる骨格を持つ9つのジアミドと3つのリン酸化物を用いてAm(III)抽出能力と最適構造との間の関係を調べた。抽出剤は金属と結合する際に5,6,7及び8員環を形成する。幾つかのジアミド化合物は配位原子として、エーテル酸素,イオウを有し、三座配位子として働く。強いリン酸化物による配位性と三座配位性によりビスジフェニルホスフォリルメタン,ビスジフェニルホスフォリルエタン,オクチルフェニルイソブチルカルバモイルメチルホスフィンオキシドとジメチルジヘキシルジグリコールアミドが高いAm(III)分配比を示した。それらの抽出能力を解明するために、La(III)-抽出剤(1:1)の構造最適化計算を行い、結合長さ,角度及び配位原子の電荷と抽出性能との関係を議論した。
小澤 正基; 小山 真一; 鈴木 達也*
Proceedings of R'09 Twin World Congress (CD-ROM), 8 Pages, 2009/09
Toward the ultimate minimization of the ecological risks originated in spent nuclear fuel recycling, a new fuel cycle paradigm was proposed. Basic researches have been actualized under the flame of Adv.-ORIENT Cycle strategy. The strategy will cover the recycle of some specific fission products as well as the enhanced P&T of all of actinides and long-lived fission product (LLFP). Among such, Ru, Rh, Pd (light PGM), Tc, Mo, Cs, Sr and Lns are newly categolized as nuclear rare metal (NRM), and thus considered as the second product of Adv.-ORIENT Cycle. Each NRM has own success scenario for their utilization. IXC and CEE will be major tool to separate such NRM from radioactive wastes. The extensive separation of NRM (along with actinides and LLFP) would not only open a new direction in fuel cycle missions, but also improve radioactive waste management either in the existing reprocessing and vitrification, or the repository tasks.