Multiplier effect on separation of Am and Cm with hydrophilic and lipophilic diamides

親水性,疎水性ジアミドを用いるAm, Cm分離に関する相乗効果

佐々木 祐二  ; 津幡 靖宏   ; 北辻 章浩  ; 須郷 由美; 白数 訓子  ; 森田 泰治  

Sasaki, Yuji; Tsubata, Yasuhiro; Kitatsuji, Yoshihiro; Sugo, Yumi; Shirasu, Noriko; Morita, Yasuji

高レベル廃液中のAm, Cm及びランタノイドは異なる処分方法が検討される、すなわちAmは核変換、Cmは中間貯蔵、そしてランタノイドは地層処分。このため、個別に分離する必要があるがこれら元素は化学的性質が酷似しているため分離は困難とされてきた。われわれは水溶性と疎水性の化合物の両方を一つの抽出系に加えて相乗効果による効率的な分離方法を検討してきた。ここでは、DOODAとDGA化合物等による分離を検討しその成果を報告する。

Following the nuclear properties, the different disposal methods for Am, Cm and lanthanides in HLW have been investigating, e.g., Am; transmutation, Cm; interim storage and Ln; geological disposal. The mutual separation is an important task. However, these trivalent Ln and An are difficult to separate due to their very similar chemical behavior, same oxidation state and similar ionic radii. We try to use both hydrophilic and lipophilic diamides in an extraction system simultaneously in order to attain the effective mutual separation. In this work, lipophilic DOODA or DGA are used as the extractant and some hydrophilic diamides are employed as the masking agents. The results of mutual separation of Am/Cm/Ln are discussed in this work.