Study on measurement of fission product nuclide 126Sn by AMS

• Published in: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2011-02, Vol.269 (3), p.392-395
• Main Authors: Shen, Hongtao, Jiang, Shan, He, Ming, Dong, Kejun, Li, Chaoli, He, Guozhu, Wu, Shaolei, Gong, Jie, Lu, Liyan, Li, Shizhuo, Zhang, Dawei, Shi, Guozhu, Huang, Chuntang, Wu, Shaoyong
• Format: Article
• Language: English
• Subjects: 126Sn; AMS; Blanks; Calibration; Fission product; Materials selection; Molecular ions; Spectrometry; Spectroscopy; Tin
• ISSN: 0168-583X; 1872-9584
• DOI: 10.1016/j.nimb.2010.11.059

A new method was developed for AMS measurement of 126 Sn. Major features of the method include the preparation of SnF 2 samples, the use of SnF 2 as target material, the selection of SnF 3 - molecular ions for the AMS measurements, and the quantitative calibration of our Beijing HI-13 AMS measurements by using samples with 126 Sn determined by γ-ray spectrometry. The results indicate that the relative uncertainty of the 126 Sn/Sn calibrated by γ-ray spectrometry is better than 4% for samples with 126 Sn/Sn of 10 −8 to −9. A beam current of 126 Sn up to 400 nA can be obtained by the combination of SnF 2/ SnF 3 - (target sample, selected ions), while 126 Te interference was reduced by 2–3 orders of magnitude. A perfect linearity ( R 2 = 0.99975) between measured and nominal 126 Sn/Sn values was obtained by using three standard samples (diluted from the one calibrated by γ-ray spectrometry) with 126 Sn/Sn ratios of 1.033 × 10 −8, 4.54 × 10 −9, 6.43 × 10 −10, respectively. A sensitivity of (1.92 ± 1.13) × 10 −10 ( 126 Sn/Sn) has been reached by measuring a blank sample.