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廃棄物に対する簡易・迅速な$$alpha$$核種分離手法の検討

Rapid separation of alpha-emitting nuclides in radioactive waste

星 亜紀子; 渡辺 幸一; 藤原 亜佐子; 原賀 智子 ; 亀尾 裕; 中島 幹雄; 武部 愼一

Hoshi, Akiko; Watanabe, Koichi; Fujiwara, Asako; Haraga, Tomoko; Kameo, Yutaka; Nakashima, Mikio; Takebe, Shinichi

低レベル放射性廃棄物に含まれるアルファ線放出核種の分析法の簡易・迅速化を目的に、抽出クロマトグラフィーによるU, Np, Pu, Am、及びCmの分離手法の検討を行った。U, Puの分離にはUTEVAレジンを、Npの分離にはTEVAレジンを、Am, Cmの分離にはTRUレジンを用いた。スキームの検討においては、分離操作がルーチン化されることを考慮し、腐食性低減のため、希硝酸をベースとした溶液でスキームを構築することを試みた。模擬廃棄物を用いた分離試験において、回収率は67$$sim$$97%と良好であり、分離の所要時間は2時間程度であった。本検討による分離スキームを実濃縮廃液に適用したところ、良好な回収率と除染係数が得られ、実用分析法として使用できる見通しを得た。

The simple and rapid separation method was developed for actinides in the low-level radioactive waste. Extraction chromatographic columns were used for the separation of U, Np, Pu, Am, and Cm in the solution of the simulated solidified product and the simulated waste solution. In the investigation of separation procedure, it was tried to construct the scheme with the relatively non-corrosive reagents aiming to apply to the routine analysis of the radioactive waste. Recoveries and decontamination factors of actinides in the solution of simulated waste were high enough to determine of actinides in radioactive waste by alpha-spectrometry, mass spectroscopy. The time required of the separation operation was 2-3 hours. The chromatographic method was applied to analysis of actinide in actual waste solution, high recoveries and decontamination factors were obtained, which indicated that the extraction chromatographic separation method would be adopted as a simple and rapid separation method of actinide in waste.

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