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Incorporating Tritiated Water into a $$^{14}$$C-Sampling System for Quantitative Estimation of$$^{14}$$C Activity in Airborne Effluent

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小嵐 淳   ; 秋山 聖光; 浅野 智宏; 横田 友和*

Koarashi, Jun; Akiyama, Kiyomitsu; Asano, Tomohiro; Yokota, Tomokazu*

$$^{14}$$Cサンプリングシステムにトリチウム水が混入した場合に、液体シンチレーション測定のための試料調製や$$^{14}$$C放射能測定値にどのような影響を及ぼすかを実験的に調査した。その結果、サンプリングに要求される空気の相対湿度限界が明らかになり、この湿度未満の空気に対しては、$$^{3}$$Hが混入していたとしてもその影響を受けずに排気中の$$^{14}$$C放射能を評価できることが示された。

Effect of incorporating tritiated water into a $$^{14}$$C sampling system on sample preparation and $$^{14}$$C activity measurement by liquid scintillation counting were investigated. Experiments derived the limit of water content in prepared sample, and also demonstrated that $$^{14}$$C activity can be determined without any interference from$$^{3}$$H contamination for clear-solution sample. The results enabled us to estimate permissible reelative humidity of air required for accomplishing sample preparation and $$^{14}$$C activity measurement. These showed that for sampling of air with less than the permissible relative humidity, total $$^{14}$$C activity in airborne effluent can be evaluated accurately with no dehumidification of air.

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