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An improved method for 85Kr analysis by liquid scintillation counting and its application to atmospheric 85Kr determination by Noriyuki Momoshima; Fumio Inoue; Shinji Sugihara; Jun Shimada; Makoto Taniguchi is a Environmental Science article available to read on EtoBox.

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Atmospheric 85 Kr concentration at Fukuoka, Japan was determined by an improved 85 Kr analytical method using liquid scintillation counting (LSC). An average value of 1.54 AE 0.05 Bq m À3 was observed in 2008, which is about two times that measured in 1981 at Fukuoka, indicating a 29 mBq y À1 rate of increase as an average for these 27 years. The analytical method developed involves collecting Kr from air using activated charcoal at liquid N 2 temperature and purifying it using He at dry ice temperature, followed by Kr separation by gas chromatography. An overall Kr recovery of 76.4 AE 8.1% was achieved when Kr was analyzed in 500e1000 l of air. The Kr isolated by gas chromatography was collected on silica gel in a quartz glass vial cooled to liquid N 2 temperature and the activity of 85 Kr was measured with a lowbackground LS counter. The detection limit of 85 Kr activity by the present analytical method is 0.0015 Bq at a 95% confidence level, including all propagation errors, which is equivalent with 85 Kr 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.

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Author

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

Publisher

Elsevier Science; Elsevier ; Elsevier BV; Publons (ISSN 0265-931X)

Published

2010

Language

EN

Field

Environmental Science (Physical Sciences)