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液体シンチレーションカウンタによるベトナムウオッカ中の放射性炭素の直接測定

Direct measurement of radioactive carbon in vietnamese vodkas by liquid scintillation counter

服部 隆充

Hattori, Takamitsu

液体シンチレーションカウンタ(LSC)計測実習への適用性の観点から、ベトナムウォッカは、例えば、無色透明でエタノール濃度は高く、蒸留酒のためエタノール以外の不純物をほとんど含まない、などの優れた特徴を有する。このベトナムウォッカがLSC計測実習用の測定試料として適切であるか否かの検討を行った。化学的な前処理操作を行わない$$^{14}$$Cの直接測定により3種類のベトナムウォッカと純粋な試薬エタノールについて、放射能濃度と比放射能を求めた。その結果、放射能濃度は試料中のエタノール濃度に比例し、ベトナムウォッカと純エタノールの比放射能は標準データである0.25Bq/g炭素とよい一致を示した。このことから、ベトナムウォッカは高い精度でLSC計測実習の測定試料として適用可能であることが結論付けられた。

From the view point of applying to laboratory exercise of radioactivity measurement by a Liquid Scintillation Counter (LSC), Vietnamese vodkas have specific features as measurement samples, for example, they are colorless, have high concentration of ethanol, and only very few organic materials are included. Investigation was made to make sure that the Vietnamese vodkas are appropriate or not as a measurement sample for the LSC exercise. Direct measurements of $$^{14}$$C without any chemical pre-treatment were made on both radioactive concentrations and specific activities of three kinds of Vietnamese vodka and also pure ethanol reagent. The LSC measurements reveal that estimated $$^{14}$$C concentration is proportional to ethanol concentration in samples and that specific activity of $$^{14}$$C shows good agreement among the Vietnamese vodkas and pure ethanol, as well as the reference value of 0.25 Bq/g of Carbon. Thus the conclusion is derived that the Vietnamese vodkas can be applied with high accuracy to the LSC exercise as measurement samples.

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