Le-yi Tu, Guo-min Yang, Xiang-yang Zhang, Shui-ming Hu. Efficient Separation of Ar and Kr from Environmental Samples for Trace Radioactive Noble Gas Detection[J]. Chinese Journal of Chemical Physics , 2016, 29(1): 151-156. doi: 10.1063/1674-0068/29/cjcp1510210
Citation: Le-yi Tu, Guo-min Yang, Xiang-yang Zhang, Shui-ming Hu. Efficient Separation of Ar and Kr from Environmental Samples for Trace Radioactive Noble Gas Detection[J]. Chinese Journal of Chemical Physics , 2016, 29(1): 151-156. doi: 10.1063/1674-0068/29/cjcp1510210

Efficient Separation of Ar and Kr from Environmental Samples for Trace Radioactive Noble Gas Detection

doi: 10.1063/1674-0068/29/cjcp1510210
  • Received Date: 2015-10-09
  • Rev Recd Date: 2015-12-24
  • Radioactive noble-gas isotopes, 85Kr (half-life t1/2=10.8 y), 39Ar (t1/2=269 y), and 81Kr (t1/2=229,000 y), are ideal tracers and can be detected by atom trap trace analysis (ATTA), a laser-based technique, from environmental samples like air and groundwater. Prior to ATTA measurements, it is necessary to efficiently extract krypton and argon gases from samples. Using a combination of cryogenic distillation, titanium chemical reaction and gas chromatography, we demonstrate that we can recover both krypton and argon gases from 1-10 L "air-like" samples with yields in excess of 90% and 98%, respectively, which meet well the requirements for ATTA measurements. A group of testing samples are analyzed to verify the performance of the system, including two groundwater samples obtained from north China plain.
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Efficient Separation of Ar and Kr from Environmental Samples for Trace Radioactive Noble Gas Detection

doi: 10.1063/1674-0068/29/cjcp1510210

Abstract: Radioactive noble-gas isotopes, 85Kr (half-life t1/2=10.8 y), 39Ar (t1/2=269 y), and 81Kr (t1/2=229,000 y), are ideal tracers and can be detected by atom trap trace analysis (ATTA), a laser-based technique, from environmental samples like air and groundwater. Prior to ATTA measurements, it is necessary to efficiently extract krypton and argon gases from samples. Using a combination of cryogenic distillation, titanium chemical reaction and gas chromatography, we demonstrate that we can recover both krypton and argon gases from 1-10 L "air-like" samples with yields in excess of 90% and 98%, respectively, which meet well the requirements for ATTA measurements. A group of testing samples are analyzed to verify the performance of the system, including two groundwater samples obtained from north China plain.

Le-yi Tu, Guo-min Yang, Xiang-yang Zhang, Shui-ming Hu. Efficient Separation of Ar and Kr from Environmental Samples for Trace Radioactive Noble Gas Detection[J]. Chinese Journal of Chemical Physics , 2016, 29(1): 151-156. doi: 10.1063/1674-0068/29/cjcp1510210
Citation: Le-yi Tu, Guo-min Yang, Xiang-yang Zhang, Shui-ming Hu. Efficient Separation of Ar and Kr from Environmental Samples for Trace Radioactive Noble Gas Detection[J]. Chinese Journal of Chemical Physics , 2016, 29(1): 151-156. doi: 10.1063/1674-0068/29/cjcp1510210
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