Single-stage accelerator mass spectrometer radiocarbon-interference identification and positive-ionisation characterisation

Wilcken, K.M., Freeman, S.P.H.T. , Xu, S. and Dougans, A. (2013) Single-stage accelerator mass spectrometer radiocarbon-interference identification and positive-ionisation characterisation. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 294, pp. 353-355. (doi:10.1016/j.nimb.2012.03.034)

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Abstract

A single-stageaccelerator mass spectrometer (SSAMS) is a good alternative to conventional spectrometers based on tandem electrostatic acceleration for radiocarbon measurement and permits experimentation with both negative and positive carbon ions. However, such 14C AMS of either polarity ions is limited by an interference. In the case of anion acceleration we have newly determined this to be summed 13C and 16O by improvising an additional Wien filter on our SSAMS deck. Also, 14C AMS might be improved by removing its dependency on negative-ionisation in a sputter ion source. This requires negative-ionisation of sample atoms elsewhere to suppress the 14N interference, which we accomplish by transmitting initially positive ions through a thin membrane. The ionisation dependence on ion-energy is found to be consistent with previous experimentation with vapours and thicker foils.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Wilcken, Mr Klaus and Dougans, Mr Andrew and Xu, Dr Sheng and Freeman, Professor Stewart
Authors: Wilcken, K.M., Freeman, S.P.H.T., Xu, S., and Dougans, A.
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
Published Online:15 May 2012

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