Identification of 129I interferences in accelerator mass spectrometry

Xu, S. and Freeman, S. P.H.T. (2019) Identification of 129I interferences in accelerator mass spectrometry. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 438, pp. 96-100. (doi:10.1016/j.nimb.2018.07.014)

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Abstract

The identification of interferences to 129In+ (n = 3-6) was conducted with a 5 MV tandem accelerator mass spectrometer at SUERC. In addition to 128Te, the detectable interferences to 12 MeV 129I3+ ions include 43Ca1+ and 86Sr2+ which are likely injected as 43Ca86Sr-, 43Ca32S18O3-, etc. whereas those to 15 MeV 129I4+ ions include 32S1+ injected as 43Ca32S18O3-, 65Cu2+ as 63Cu65Cu1H-, 97Mo3+ as 97Mo16O2-. The 18 MeV 129I5+ ions might be interfered by 77Se3+ and 104Pd4+ (or 104Ru4+) and the 21 MeV 129I6+ ions by 43Ca2+, 65Cu3+, 86Sr4+ and 108Pd5+ (or 107Ag5+, 108Cd5+). Apart from 128Te, these ions can be fully separated from 129I in the gas ionization detector equipped with a thin SiN membrane window and propane gas, which contributes negligibly to the 129I-AMS detection for samples after careful chemical preparation. Although the 129I background is mainly controlled by Te content and the source memory, the rareness of Te in natural environmental samples results in our routine background 129I/127I level in range of ~10-14. The precision and accuracy of 3 % can be routinely achieved at 129I/127I >10-12 level at SUERC.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Xu, Dr Sheng and Freeman, Professor Stewart
Authors: Xu, S., and Freeman, S. P.H.T.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Publisher:Elsevier
ISSN:0168-583X
ISSN (Online):0168-583X
Published Online:28 July 2018
Copyright Holders:Copyright © 2018 Elsevier
First Published:First published in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 438: 96-100
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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