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Degradation behaviors of the TODGA/SiO$$_{2}$$-P adsorbent for extraction chromatography

抽出クロマトグラフィに用いるTODGA/SiO$$_{2}$$-P吸着剤の劣化挙動

宮崎 康典 ; 渡部 創 ; 佐野 雄一 ; 小藤 博英 ; 竹内 正行 ; 石神 龍哉*

Miyazaki, Yasunori; Watanabe, So; Sano, Yuichi; Kofuji, Hirohide; Takeuchi, Masayuki; Ishigami, Ryoya*

使用済み核燃料からマイナーアクチノイド(MA)を回収する方法として、抽出クロマトグラフィが用いられている。高分子ポリマーでコーティングした多孔SiO$$_{2}$$粒子にCMPO等の抽出剤を添加した吸着剤をカラムに充てんし、AmやCmなどの特定元素の群分離及び単離を行う。これまで高レベル放射性廃液からの放射線を模擬したHe$$^{2+}$$イオンや$$gamma$$線を照射し、劣化した吸着剤の安全性評価が進められてきた。本研究では、近年開発が進められているMA抽出剤の一つであるTODGAに的を絞り、TODGA/SiO$$_{2}$$-P吸着材の分解物の特定を行った。

Extraction chromatography has been employed to separate minor actinides (MAs) from spent nuclear fuel for the purpose of reducing environmental impact. In our strategy, the polymer-coated SiO$$_{2}$$ particle with an extractant is packed in a column and utilized for group separation and/or isolation of the specific element (Am and Cm, for example) from high level liquid waste. The safety use of chromatography was assessed by irradiation to the adsorbent with He$$^{2+}$$ beam and $$gamma$$ ray to simulate the high-level nuclear waste. In this study, we focused on a recently developed extractant TODGA and its degradation behavior on top of the SiO$$_{2}$$-P adsorbent was investigated by a similar experimental manner.

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