Measurement of the half-life of <SUP>79</SUP>Se with accelerator mass spectrometry

DOU Liang; JIANG Shan; WANG Xiao-Bo; DONG Ke-Jun; WU Shao-Yong; YANG Xu-Ran; WANG Xiao-Ming; LAN Xiao-Xi; XIA Qing-Liang; HE Ming

doi:10.1088/1674-1137/38/10/106204

Chinese Physics C> 2014, Vol. 38> Issue(10) : 106204 DOI: 10.1088/1674-1137/38/10/106204

Measurement of the half-life of ⁷⁹Se with accelerator mass spectrometry

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Abstract：
The accelerator mass spectrometry (AMS) is an effective method for the determination of the half-life of long-lived radionuclides. In this paper, we report a method for measurement of the half-life of ⁷⁹Se. The number of ⁷⁹Se atoms was determined from measured ⁷⁹Se/Se absolute ratios with the AMS system at the China Institute of Atomic Energy and the decay rate of ⁷⁹Se was determined by counting the emitted β-rays with a liquid scintillation spectrometer. The major improvements of our measurements include using the high abundance of an ⁷⁹Se sample which was cooled for many years to exclude the interference of short-lived nuclides, the extraction of SeO₂^- molecular ions, that results in a suppression of the ⁷⁹Br background by as much as about five orders of magnitude. Also, an AMS measurement of the absolute ratio of ⁷⁹Se/Se was developed to avoid systematic errors. The results show that ⁷⁹Se/Se is (2.35±0.12)×10^-7 in the reference sample and the radioactivity of ⁷⁹Se is (1.24±0.05) Bq/g, so the half-life of ⁷⁹Se is (2.78±0.18)×10⁵ a.

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DOU Liang, JIANG Shan, WANG Xiao-Bo, DONG Ke-Jun, WU Shao-Yong, YANG Xu-Ran, WANG Xiao-Ming, LAN Xiao-Xi, XIA Qing-Liang and HE Ming. Measurement of the half-life of ⁷⁹Se with accelerator mass spectrometry[J]. Chinese Physics C, 2014, 38(10): 106204. doi: 10.1088/1674-1137/38/10/106204

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Received: 2013-10-09
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Measurement of the half-life of ⁷⁹Se with accelerator mass spectrometry

Corresponding author: HE Ming,

Received Date: 2013-10-09

Accepted Date: 1900-01-01

Available Online: 2014-10-05

Abstract: The accelerator mass spectrometry (AMS) is an effective method for the determination of the half-life of long-lived radionuclides. In this paper, we report a method for measurement of the half-life of ⁷⁹Se. The number of ⁷⁹Se atoms was determined from measured ⁷⁹Se/Se absolute ratios with the AMS system at the China Institute of Atomic Energy and the decay rate of ⁷⁹Se was determined by counting the emitted β-rays with a liquid scintillation spectrometer. The major improvements of our measurements include using the high abundance of an ⁷⁹Se sample which was cooled for many years to exclude the interference of short-lived nuclides, the extraction of SeO₂^- molecular ions, that results in a suppression of the ⁷⁹Br background by as much as about five orders of magnitude. Also, an AMS measurement of the absolute ratio of ⁷⁹Se/Se was developed to avoid systematic errors. The results show that ⁷⁹Se/Se is (2.35±0.12)×10^-7 in the reference sample and the radioactivity of ⁷⁹Se is (1.24±0.05) Bq/g, so the half-life of ⁷⁹Se is (2.78±0.18)×10⁵ a.

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Measurement of the half-life of ⁷⁹Se with accelerator mass spectrometry

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Measurement of the half-life of 79Se with accelerator mass spectrometry

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Measurement of the half-life of 79Se with accelerator mass spectrometry

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Measurement of the half-life of ⁷⁹Se with accelerator mass spectrometry

Measurement of the half-life of ⁷⁹Se with accelerator mass spectrometry