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Developments in Sample Combustion to Carbon Dioxide, and in the Oxford AMS Carbon Dioxide Ion Source System

Published online by Cambridge University Press:  18 July 2016

R. E. M. Hedges ,
M. J. Humm ,
John Foreman ,
G. J. Van Klinken  and
C. R. Bronk
R. E. M. Hedges
Affiliation:
Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, University of Oxford, 6 Keble Road, Oxford OX1 3QJ, UK
M. J. Humm
Affiliation:
Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, University of Oxford, 6 Keble Road, Oxford OX1 3QJ, UK
John Foreman
Affiliation:
Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, University of Oxford, 6 Keble Road, Oxford OX1 3QJ, UK
G. J. Van Klinken
Affiliation:
Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, University of Oxford, 6 Keble Road, Oxford OX1 3QJ, UK
C. R. Bronk
Affiliation:
Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, University of Oxford, 6 Keble Road, Oxford OX1 3QJ, UK
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Abstract

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We describe the operation of a commercial system as modified for preparation of CO2 for the CO2 source. AMS samples are automatically combusted in a CHN analyzer, and stable isotope measurements are made on line. We describe the performance of this equipment, with reference to yield, sample contamination, memory effect, accuracy of isotope measurement, convenience and cost. We discuss the current status of dating using the CO2 source. This is the only source in operation at Oxford, and has been in routine dating since September 1989. We assess the practicalities of operation, including the latest measurements on background, memory, sample-size requirements and operating schedules. We also describe modifications to the sputter beam optics and to the gas handling systems.

Information

Type
I. Sample Preparation and Measurement Techniques
Information
Radiocarbon , Volume 34 , Issue 3: Proceedings of the 14th International Radiocarbon Conference , 1992 , pp. 306 - 311
Copyright
Copyright © The American Journal of Science 

References

Bronk, C. R. and Hedges, R. E. M. 1987 A gas ion source for radiocarbon dating. In Gove, H. E., Litherland, A. E. and Elmore, D., eds., Proceedings of the 4th International Symposium on Accelerator Mass Spectrometry. Nuclear Instruments and Methods B29: 45–49.Google Scholar
Bronk, C. R. and Hedges, R. E. M. 1989 Use of the CO2 source in radiocarbon dating by AMS. In Long, A. and Kra, R. S., eds., Proceedings of the 13th International 14C Conference. Radiocarbon 31(3): 298–304.Google Scholar
Bronk, C. R. and Hedges, R. E. M. 1990 A gaseous ion source for routine AMS dating. In Yiou, F. and Raisbeck, G. M., eds., Proceedings of the 5th International Conference on Accelerator Mass Spectrometry. Nuclear Instruments and Methods B52(3,4): 322–326.CrossRefGoogle Scholar
Middleton, R. 1983 A versatile high intensity negative ion source. In Reading, J. F., ed., Proceedings of the International Workshop on Cross Sections for Fusion and Other Applications. Nuclear Instruments and Methods 214: 139–150.CrossRefGoogle Scholar
Middleton, R., Klein, J. and Fink, D. 1989 A CO2 negative ion source for 14C dating. Nuclear Instruments and Methods B43: 231–239.Google Scholar