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

  • 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] . HE Ming, JIANG Song-Sheng, JIANG Shan et al. Nucl.Instrum. Methods B, 2002, 194: 3932. ZHOU Chun-Mei, WU Zhen-Dong. Atomic Energy Scienceand Technology, 2006, 40-4 (in Chinese)3. LIU Jian-Fu, ZHANG Jin-Jie, ZHANG Yong-Kang. Jour-nal of Jishou University (Nature Science Edition) 1997, 18-3(in Chinese)4. Clark C, Kalkin B, Krongrad A et al. Decreased Incidenceof Prostate Cancer With Selenium Supplementation: Re-sults of a Double-Blind Cancer Prevention Trial [J] Br JUrol, 1998, 81(5): 730-7345. LUSH D T. Preventing Heart Disease and Cancer. WhatRandomized, Primary-Prevention Studies Show [J]. Post-grad Med, 1999, 106(5): 143-1486. BAUM M K, Shor-Posner G, LAI S et al. High Risk ofHIV-Related Mortality ls Associated With Selenium De -ciency [J]. J Acquir Immune De c Syndr Hum Retrovirol,1997, 15(5): 370-3747. CHEN C Y, ZHOU J Y, XU H B et al. E ect of SeleniumSupplenemtation on Mice Infected With LP-BM5 MuLV, aMurine AIDS Model [J]. Biol. Trace. Element. Res., 1997,59(1-3): 187-1938. YU R, GUO J, CUI A et al. J. Radianal. Nucl. Chem.,1995, 196(1): 1659. JIANG Song-Sheng, HE Ming, DIAO Li-Jun et al. Nucl.Instrum. Methods A, 2002, 489: 195-20110. Philippe B, Philippe C, Gilbert A. Appl. Radiat. Isotopes,2007, 65: 35511. REN Tong-Xiang, ZHANG Ji-Long, PAN Jing-Shun. Mea-surements of 79Se Half Life. et al. CNRCS 2007 (in Chinese)12. Dewberry R A, Leyba J D, Boyce W T, Radianal J. Nucl.Chem., 2000, 245(3): 49113. Jerome C, Philippe B, Eric B et al. J. Anal. At. Spectrom,2003, 18: 702-70714. Sandrine Aguerre, Carole Frechou. Talanta, 2006, 69:565-57115. Carol Frechou, Sandrine Aguerre, Jean-Pierre Degros. Ta-lanta, 2007, 72: 1166-117116. Rugel G, Dillmann I, Faestermann T et al. Nucl. Instrum.Methods B, 2007, 259μ68317. JIANG Song-Sheng. Physics, 1985, 14(8): 481 (in Chinese)18. HE Ming, JIANG Shan, JIANG Song-Sheng et al. Nucl.Instrum. Methods B, 2004, 223-224: 7819. LI Chao-Li, WANG Wei, HE Ming et al. A Bragg CurveDetector and Its Application in AMS Measurements forMedium-Weight Nuclides (this publication)(in Chinese)
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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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Measurements of 79Se with AMS based on extracting molecular negative ions

    Corresponding author: WANG Wei,

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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