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液体シンチレーションカウンタを用いた排水中$$^{89}$$Sr及び$$^{90}$$Sr迅速分析法

Rapid analysis method of $$^{89}$$Sr and $$^{90}$$Sr in effluent with a liquid scintillation counter

中野 政尚 ; 檜山 佳典; 渡辺 均; 住谷 秀一 

Nakano, Masanao; Hiyama, Yoshinori; Watanabe, Hitoshi; Sumiya, Shuichi

排水中$$^{89}$$Sr, $$^{90}$$Sr分析を行うにあたって、$$beta$$線最大エネルギーの違いを利用して、液体シンチレーションカウンタを用いた迅速分析法について検討した。本法により妨害核種($$^{54}$$Mn, $$^{60}$$Co, $$^{106}$$Ru, $$^{137}$$Cs)を含む模擬試料を分析したところ、十分な分析精度と回収率が得られた。また従来法では分析に2$$sim$$3週間要していたが、本法では3$$sim$$4日間で分析できることから、排水中$$^{89}$$Sr, $$^{90}$$Sr分析として、十分に適用可能な優れた方法であることを確認した。

The rapid analysis method of $$^{89}$$Sr and $$^{90}$$Sr in effluent has been investigated by a liquid scintillation counter, which could distinguish the difference of beta energy. Analyzed the imitation effluent samples including interference radionuclides such as $$^{54}$$Mn, $$^{60}$$Co, $$^{106}$$Ru, $$^{137}$$Cs, the good accuracy, precision and chemical recovery were obtained in the analyses. It took only 3 or 4 days to analyze them by this method, though it took a few weeks by the conventional methods. These facts made it sure that this method was worth enough for the analysis of $$^{89}$$Sr and $$^{90}$$Sr in effluent.

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