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Sensitivity of charged particle activation analysis for long-lived radioactive nuclide determination

長寿命放射性核種定量に対する荷電粒子放射化分析法の分析感度

大島 真澄*; 山口 友理恵*; 浅井 雅人; 塚田 和明; 後藤 淳*; 伴場 滋*; Bi, C.*; 森本 隆夫*

Oshima, Masumi*; Yamaguchi, Yurie*; Asai, Masato; Tsukada, Kazuaki; Goto, Jun*; Bamba, Shigeru*; Bi, C.*; Morimoto, Takao*

長寿命放射性核種35核種の定量のため、8MeV陽子ビームを用いた荷電粒子放射化分析法の分析感度について調査した。それらの核種に対する核反応断面積はALICE-91コードによって見積もり、核異性体生成比は近傍同位体の値からそれらのスピン・パリティの値を考慮して見積もった。その結果、提案する荷電粒子放射化分析法は$$^{135}$$Cs, $$^{244}$$Pu, $$^{129}$$I, $$^{126}$$Sn, $$^{93}$$Mo, $$^{107}$$Pd, $$^{236}$$U, $$^{248}$$Cm, $$^{237}$$Npなどのいくつかの難測定長寿命核種に対して高い感度を示すことが判った。

Sensitivity of charged particle activation analysis with 8 MeV proton beam was studied for determination of 35 long-lived radioactive nuclides. Reaction cross sections for those nuclides were estimated with ALICE-91 code and isomer yield ratios were estimated from those of neighboring isotopes by taking into account their spins and parities. It was found that the proposed charged particle activation analysis should show high sensitivity for the determination of several hardly measurable nuclides with long half-lives such as $$^{135}$$Cs, $$^{244}$$Pu, $$^{129}$$I, $$^{126}$$Sn, $$^{93}$$Mo, $$^{107}$$Pd, $$^{236}$$U, $$^{248}$$Cm, and $$^{237}$$Np.

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