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MA分離抽出剤HONTAの$$gamma$$線分解による抽出能変化

Influence of $$gamma$$-radiolysis of MA separation agent of HONTA on extraction performance

樋川 智洋  ; 鈴木 英哉; 伴 康俊 ; 石井 翔*; 松村 達郎 

Toigawa, Tomohiro; Suzuki, Hideya; Ban, Yasutoshi; Ishii, Sho*; Matsumura, Tatsuro

マイナーアクチノイド(MA)に対する優れた抽出分離能を持つ新規抽出剤、ヘキサオクチルニトリロトリアセトアミド(HONTA)の耐放射線性能評価の一環として、ドデカン溶媒中での$$gamma$$線照射によるランタノイド元素(Ln)の抽出能変化を調べた。その結果、HONTAの$$gamma$$線分解生成物による新たな元素抽出能の出現は認められず、また分配比の減少は$$gamma$$線照射に伴うHONTAの分解による濃度変化に起因することがわかった。

To evaluate the radiolytic stability of a novel tetradentate extractant of N, N, N', N', N", N"-hexaoctyl-nitrilotriacetamide (HONTA), batch extractions of lanthanide (Ln) elements were performed by using $$gamma$$-irradiated HONTA extraction solvents. The distribution ratios decreased exponentially with increasing the absorbed dose, and no difference between Ln could be observed. These indicate that the degradation products of HONTA did not act as Ln extractants, and the decay of Ln extraction were caused by degradation of HONTA.

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