36Cl accelerator mass spectrometry with a bespoke instrument

Wilcken, K.M., Freeman, S.P.H.T. , Schnabel, C., Binnie, S.A., Xu, S. and Phillips, R. (2013) 36Cl accelerator mass spectrometry with a bespoke instrument. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 294, pp. 107-114. (doi:10.1016/j.nimb.2012.04.027)

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Abstract

Cosmogenic 36Cl analysis by accelerator mass spectrometry (AMS) is a valuable environmental and geological sciences research tool. Overcoming the stable nuclide 36S isobar interfering with measurement is challenging, however. Traditionally this has required large accelerators, but following recent technical advances it is now possible with "3C30 MeV ion energies. Consequently 5 MV or even smaller modern bespoke spectrometers are now 36Cl-capable, increasing accessibility and promoting wider and more varied 36Cl use. However, the technical ability to identify 36Cl ions is quite distinct from demonstrated high-performance AMS. Such is the theme of this paper. We present a systematic analysis of the accurate measurement of sample radioisotope relative to the stable chlorine, the normalisation of the measured ratio and correction for remaining 36S interference, all combined with the use of stable-isotope dilution to determine sample Cl concentration to begin with. We conclude by showing that repeated analyses support our claims for routine 3% 36Cl-AMS data. Accordingly, the modest SUERC spectrometer well competes with the performance of larger longer-established instruments, and the results may be quite generic for modern bespoke instruments.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Wilcken, Mr Klaus and Xu, Dr Sheng and Freeman, Professor Stewart and Schnabel, Dr Christoph
Authors: Wilcken, K.M., Freeman, S.P.H.T., Schnabel, C., Binnie, S.A., Xu, S., and Phillips, R.
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
ISSN:0168-583X
Published Online:06 May 2012

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