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

摘要：

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 SeO-/2 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 (5.164±1.80)× 10-11.

关键词： 79Se accelerator mass spectrometry (AMS) extraction form molecular negative ions isobar Bragg curve detector

作者: WANG Wei(王伟) Chao-Li(李朝历) HE Ming(何明) WU Shao-Yong(武绍勇) JIANG Shan(姜山)

作者单位: Department of Nuclear Physics,China Institute of Atomic Energy,Beijing 102413,China Physical Science and Engineering Technology Department,Guangxi university,Nanning 530004,China

会议类型: 国际会议

会议名称: The 13th National Nuclear Physics Conference of China(第十三届全国核物理大会暨第八届会员代表大会)

会议地点: 兰州

会议语种:英文

页码: 205-209

在线出版日期: 2007-08-22（万方平台首次上网日期，不代表论文的发表时间）