An improved method for 85Kr analysis by liquid scintillation counting and its application to atmospheric 85Kr determination

Noriyuki Momoshima, Fumio Inoue, Shinji Sugihara, Jun Shimada, Makoto Taniguchi

研究成果: ジャーナルへの寄稿学術誌査読

22 被引用数 (Scopus)

抄録

Atmospheric 85Kr concentration at Fukuoka, Japan was determined by an improved 85Kr analytical method using liquid scintillation counting (LSC). An average value of 1.54 ± 0.05 Bq m-3 was observed in 2008, which is about two times that measured in 1981 at Fukuoka, indicating a 29 mBq y-1 rate of increase as an average for these 27 years. The analytical method developed involves collecting Kr from air using activated charcoal at liquid N2 temperature and purifying it using He at dry ice temperature, followed by Kr separation by gas chromatography. An overall Kr recovery of 76.4 ± 8.1% was achieved when Kr was analyzed in 500-1000 l of air. The Kr isolated by gas chromatography was collected on silica gel in a quartz glass vial cooled to liquid N2 temperature and the activity of 85Kr was measured with a low-background LS counter. The detection limit of 85Kr activity by the present analytical method is 0.0015 Bq at a 95% confidence level, including all propagation errors, which is equivalent with 85Kr in 1.3 l of the present air under the analytical conditions of 72.1% counting efficiency, 0.1597 cps background count rate, and 76.4% Kr recovery.

本文言語英語
ページ(範囲)615-621
ページ数7
ジャーナルJournal of Environmental Radioactivity
101
8
DOI
出版ステータス出版済み - 8月 1 2010

!!!All Science Journal Classification (ASJC) codes

  • 環境化学
  • 廃棄物管理と処理
  • 汚染
  • 健康、毒物学および変異誘発

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