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緊急時環境モニタリングのための空気中プルトニウム放射能濃度測定装置の開発

Development of a plutonium air monitor for emergency environmental monitoring

木内 伸幸 ; 大石 哲也 ; 野口 宏; 吉田 真; 加藤 正平; 伊藤 勝人*

Kinouchi, Nobuyuki; Oishi, Tetsuya; Noguchi, Hiroshi; Yoshida, Makoto; Kato, Shohei; Ito, Katsuhito*

再処理施設の緊急時環境モニタリングのために、空気中のプルトニウム濃度を迅速かつ高感度に測定できるダストモニタを開発した。プルトニウムはフィルタに捕集され、$$alpha$$線スペクトル測定が行われる。大気圧状態の連続測定と真空状態のバッチ測定の2方式を採用した。ダストモニタの概要と特性試験の結果について報告する。

We have developed an air monitor which is possible to measure rapidly and sensitively the concentration of plutonium for the environmental monitoring at an accident of a nuclear reprocessing plant. The monitor is designed to collect airborne plutonium by drawing the ambient air through a filter and to detect the activity by alpha spectroscopy. The following two methods are equipped with the monitor: continuous measurement at atomospheric pressure and batch measurement at vacuum. The description of the air monitor and the results of performance test are reported.

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