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多段分離型ICP-MSによるアクチノイド同位体の一斉検出

Simultaneous determination of actinide isotopes by inductively coupled plasma-mass spectrometry incorporating cascade separation step

松枝 誠   ; 川上 智彦*; 照山 優子*; 寺島 元基  ; 飯島 和毅  ; 古川 真*; 高貝 慶隆*

Matsueda, Makoto; Kawakami, Tomohiko*; Teruyama, Yuko*; Terashima, Motoki; Iijima, Kazuki; Furukawa, Makoto*; Takagai, Yoshitaka*

福島第一原子力発電所の廃炉に向けて、滞留水や廃棄物に含まれるアクチノイド(Th, U, Np, Pu, Am, Cmなど)の量を把握していく必要があるが、従来の放射能分析では時間や労力がかかる。ICP-MSは、アクチノイドの一斉分析による迅速化が可能であるものの、多数の同重体により定量が妨害される。今回、ICP-MSの反応セル内での気相反応と固相抽出を組み合わせた多段分離型の自動分析法によりアクチノイドの一斉検出を試みた。

Determination of actinides (e.g., Th, U, Np, Pu, Am, Cm) in contaminated water and nuclear waste is important for decommissioning the Fukushima Daiichi Nuclear Power Station. However, traditional radiochemical analysis needs a time-consuming process and large effort. ICP-MS has the potential of rapid determination by simultaneous detection of actinides, while many isobaric interferences prevent the quantification. In this study, we developed an automatic analysis method using ICP-MS incorporating cascade separation steps (solid phase separation and gas phase reaction in the dynamic reaction cell) to simultaneously determine actinides.

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