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Am/Cm分離用抽出剤、ADAAMによる抽出基礎特性

Basic information on solvent extraction using ADAAM for Am/Cm separation

佐々木 祐二  ; 金子 政志   ; 伴 康俊  ; 鈴木 英哉*

Sasaki, Yuji; Kaneko, Masashi; Ban, Yasutoshi; Suzuki, Hideya*

マイナーアクチノイドであるAm, Cmは類似の化学的性質を持ち、一般に相互分離は難しい。一方、自発核分裂により中性子を放出するCmと長半減期核種の核変換が望まれるAmの分離要求がある。従来溶媒抽出法で相互分離は困難であったが、原子力機構で開発された含アミン窒素3座配位性ジアミド抽出剤のADAAMは硝酸-ドデカン系でAm/Cmのたいへん高い分離比を示した。そこで我々は、Am/Cm相互分離性や新たな基礎特性を含めた溶媒抽出に関する情報を提供するため、ADAAMの誘電率や粘性、比重などの物性に加えて、水溶性のAn錯形成剤と組み合わせたときのAm/Cm分離比の変動について調査した。

Am and Cm as minor actinides, have the similar chemical behavior, thus both metals are, in general, hard to separate. On the other hand, separation of Am with long-lived radionuclide to transmute from Cm to emit neutrons by spontaneous fission has been requesting. Although the mutual separation by solvent extraction is a tough work, ADAAM (Alkyl DiAmide AMine) developed in JAEA show high separation factor of Am/Cm of around 6 at HNO$$_{3}$$-n-dodecane system. We focus on basic research on solvent extraction using ADAAM and investigate the physical properties, i.e., polarity and viscosity, and separation factors of Am/Cm variated in combination with water-soluble masking agent of An, and will show the information at the meeting.

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