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Use of the CO2 Source in Radiocarbon Dating by AMS

Published online by Cambridge University Press:  18 July 2016

C R Bronk
Affiliation:
Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology, University of Oxford 6 Keble Road, Oxford OX1 3QJ, United Kingdom
R E M Hedges
Affiliation:
Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology, University of Oxford 6 Keble Road, Oxford OX1 3QJ, United Kingdom
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Abstract

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Since Middleton showed the potential for a sputter source working from CO2, we have been building a source which can automatically change samples. The source produces a maximum beam of 25μA of C, with typical operation between 10 and 20μA. Although beam generation from the source is very reliable, the mechanics of sample changing have given considerable problems. The changing of samples also involves considerable care in gas handling, and a computer control system has been written which ensures the correct sequence of the 16 operations required for sample change.

Type
I. Sample Preparation and Measurement Techniques
Copyright
Copyright © The American Journal of Science 

References

Bronk, C R and Hedges, R E M, 1987, A gas ion source for radiocarbon dating: Nuclear Instruments & Methods, v B29, p 4549.CrossRefGoogle Scholar
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Middleton, R, 1984, A versatile high intensity negative ion source: Nuclear Instruments & Methods, v 220, p 105106.CrossRefGoogle Scholar