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

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 SeO 2 - molecular ions, that results in a suppression of the 79 Br background by as much as about five orders of magnitude. Also, an AMS measurement of the absolute ratio of 79 Se/Se was developed to avoid systematic errors. The results show that 79 Se/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)×10 5 a.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1]
  1. China Institute of Atomic Energy, Beijing (China)
  2. China Institute of Atomic Energy, Beijing (China); Guangxi Univ., Nanning (China)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Chinese Physics. C, High Energy Physics and Nuclear Physics
Additional Journal Information:
Journal Volume: 38; Journal Issue: 10; Journal ID: ISSN 1674-1137
Publisher:
IOP Publishing
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79Se; half-life; AMS; attenuator
OSTI Identifier:
1407221

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. United States: N. p., Web. doi:10.1088/1674-1137/38/10/106204.
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. Measurement of the half-life of 79Se with accelerator mass spectrometry. United States. doi:10.1088/1674-1137/38/10/106204.
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. 2014. "Measurement of the half-life of 79Se with accelerator mass spectrometry". United States. doi:10.1088/1674-1137/38/10/106204. https://www.osti.gov/servlets/purl/1407221.
@article{osti_1407221,
title = {Measurement of the half-life of 79Se with accelerator mass spectrometry},
author = {Dou, Liang and Jiang, Shan and Wang, Xiao-Bo and Dong, Ke -Jun and Wu, Shao -Yong and Yang, Xu -Ran and Wang, Xiao -Ming and Lan, Xiao -Xi and Xia, Qing -Liang and He, Ming},
abstractNote = {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 79 Br background by as much as about five orders of magnitude. Also, an AMS measurement of the absolute ratio of 79 Se/Se was developed to avoid systematic errors. The results show that 79 Se/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.},
doi = {10.1088/1674-1137/38/10/106204},
journal = {Chinese Physics. C, High Energy Physics and Nuclear Physics},
number = 10,
volume = 38,
place = {United States},
year = {2014},
month = {10}
}