AI Article Synopsis
- Researchers improved a method for measuring atmospheric (85)Kr concentration in Fukuoka, Japan, using liquid scintillation counting, achieving an average detection of 1.54 +/- 0.05 Bq m(-3) in 2008, which is double the level measured in 1981.
- The study found a steady increase of 29 mBq y(-1) over 27 years, indicating rising levels of (85)Kr in the atmosphere.
- The analytical process involved collecting and purifying Kr gas, achieving a recovery rate of 76.4 +/- 8.1%, and establishing a detection limit of 0.0015 Bq at a 95% confidence level, indicating high sensitivity and accuracy of
Article Abstract
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 +/- 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 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 +/- 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 N(2) temperature and the activity of (85)Kr was measured with a low-background 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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| http://dx.doi.org/10.1016/j.jenvrad.2010.03.009 | DOI Listing |
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