Measurements of <SUP>79</SUP>Se with AMS based on extracting molecular negative ions

WANG Wei; LI Chao-Li; HE Ming; WU Shao-Yong; JIANG Shan

Chinese Physics C> 2008, Vol. 32> Issue(S2) : 205-209

Measurements of ⁷⁹Se with AMS based on extracting molecular negative ions

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Abstract：
A new method for measuring selenium-79 with AMS, which is based on extracting molecular negative ions, is described in this paper. According to the experimental results, the extraction ion form SeO₂^－ could depress the interference of Bromine-79 as much as 5 order levels, that is to say, the background of ⁷⁹Br can be deducted to ⁷⁹Br/Se≈10^－10. By the way, the chemical form of sample and preparation flow was also developed. Finally, three ⁷⁹Se AMS calibration standard samples with theoretical ⁷⁹Se/Se ratios of 5.06×10^－7, 6.87×10^－8, 5.40×10^－10 were obtained and the method of ⁷⁹Se measurement was set up, which actualized transmission and detection of ⁷⁹Se. By using our Bragg curve detector, the two isobars ⁷⁹Br and ⁷⁹Se could be partly identified to a certain extent and ⁷⁹Se can be identified from ⁷⁹Br about 1 order level. AMS measurements of the three calibration standard samples above were performed and good linearity was obtained. The sensitivity of the measurement is (5.16±1.80)×10^－11.

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[1]

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WANG Wei, LI Chao-Li, HE Ming, WU Shao-Yong and JIANG Shan. Measurements of ⁷⁹Se with AMS based on extracting molecular negative ions[J]. Chinese Physics C, 2008, 32(S2): 205-209.

WANG Wei, LI Chao-Li, HE Ming, WU Shao-Yong and JIANG Shan. Measurements of ⁷⁹Se with AMS based on extracting molecular negative ions[J]. Chinese Physics C, 2008, 32(S2): 205-209. shu

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Received: 2008-07-17
Revised: 1900-01-01

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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

Measurements of ⁷⁹Se with AMS based on extracting molecular negative ions

Corresponding author: WANG Wei,

Received Date: 2008-07-17

Accepted Date: 1900-01-01

Available Online: 2008-01-03

Abstract: A new method for measuring selenium-79 with AMS, which is based on extracting molecular negative ions, is described in this paper. According to the experimental results, the extraction ion form SeO₂^－ could depress the interference of Bromine-79 as much as 5 order levels, that is to say, the background of ⁷⁹Br can be deducted to ⁷⁹Br/Se≈10^－10. By the way, the chemical form of sample and preparation flow was also developed. Finally, three ⁷⁹Se AMS calibration standard samples with theoretical ⁷⁹Se/Se ratios of 5.06×10^－7, 6.87×10^－8, 5.40×10^－10 were obtained and the method of ⁷⁹Se measurement was set up, which actualized transmission and detection of ⁷⁹Se. By using our Bragg curve detector, the two isobars ⁷⁹Br and ⁷⁹Se could be partly identified to a certain extent and ⁷⁹Se can be identified from ⁷⁹Br about 1 order level. AMS measurements of the three calibration standard samples above were performed and good linearity was obtained. The sensitivity of the measurement is (5.16±1.80)×10^－11.

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Measurements of ⁷⁹Se with AMS based on extracting molecular negative ions

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Measurements of ⁷⁹Se with AMS based on extracting molecular negative ions

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Measurements of 79Se with AMS based on extracting molecular negative ions

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Measurements of ⁷⁹Se with AMS based on extracting molecular negative ions

Measurements of ⁷⁹Se with AMS based on extracting molecular negative ions