保健物理
Online ISSN : 1884-7560
Print ISSN : 0367-6110
ISSN-L : 0367-6110
炭素-14測定のために合成したベンゼン中の不純物とそれらの放射能測定への影響
川村 秀久村山 美保藤原 浩二東房 健一古田 佳正松岡 信明高尾 真一高島 良正百島 則幸
著者情報
ジャーナル フリー

1998 年 33 巻 1 号 p. 17-24

詳細
抄録

Impurities were analyzed in the benzene synthesized from an environmental sample for 14C measurement and influence of the impurities on 14C activity measurement was examined. Chloride, nitrite, nitrate, phosphate, sulfate ions were observed in the benzene. Contamination of inner glass surface of the synthesis line, especially traps, was found to be a source for these impurities. Toluene, ethyl benzene, o-xylene and grease which was used for connections and cocks in the line were detected. The amount of benzene-derivatives was small and did not act as quenchers in 14C measurement. On the other hand, a large amount of grease (DOW CORNING HIGH VACUUM SILICONE GREASE) was observed in the synthesized benzene, resulting in underestimation of 14C activity. Alternative grease (Shin-Etsu Co., Ltd.; FG-721) is insoluble to benzene. 14C concentration of NBS RM49 showed in good agreement with the recommended value when FG-721 was used, suggesting a suitability for the benzene synthesis.

著者関連情報
© 日本保健物理学会
前の記事 次の記事
feedback
Top