Hostname: page-component-745bb68f8f-cphqk Total loading time: 0 Render date: 2025-01-08T15:27:49.031Z Has data issue: false hasContentIssue false
  • English
  • Français

Illumination of a Black Box: Analysis of Gas Composition During Graphite Target Preparation

Published online by Cambridge University Press:  18 July 2016

A. P. McNichol ,
A. R. Gagnon ,
G. A. Jones  and
E. A. Osborne
A. P. McNichol
Affiliation:
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 USA
A. R. Gagnon
Affiliation:
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 USA
G. A. Jones
Affiliation:
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 USA
E. A. Osborne
Affiliation:
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 USA
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We conducted a study of relative gas composition changes of CO2, CO and CH4 during the formation of graphite targets using different temperatures, catalysts and methods. Reduction with H2 increases the reaction rate without compromising the quality of the AMS target produced. Methane is produced at virtually any temperature, and the amount produced is greater at very low temperatures. The reduction of CO to graphite is very slow when H2 is not included in the reaction.

Type
I. Sample Preparation and Measurement Techniques
Information
Radiocarbon , Volume 34 , Issue 3: Proceedings of the 14th International Radiocarbon Conference , 1992 , pp. 321 - 329
Copyright
Copyright © The American Journal of Science 

References

Boudouard, O. 1901 Recherches sur les equilibres chimiques. Annales de Chimie et de Physique 24(7): 5–85.Google Scholar
Jull, A. J. T., Donahue, D. J., Hatheway, A. L., Linick, T. W. and Toolin, L. J. 1986 Production of graphite targets by deposition from CO/H2 for precision accelerator 14C measurements. In Stuiver, M. and Kra, R. S. eds., Proceedings of the 12th International 14C Conference. Radiocarbon 28 (2A): 191–197.Google Scholar
Gagnon, A. R. and Jones, G. A. 1991 AMS radiocarbon results obtained from graphite targets produced at the Woods Hole Oceanographic Institution between 1986 and 1990. Abstract. Radiocarbon 32(2): 198.Google Scholar
Manning, M. P. and Reid, R. C. 1977 C-H-O systems in the presence of an iron catalyst. Industrial Engineering and Chemistry, Process Design and Development 16(3): 358–361.CrossRefGoogle Scholar
O’Hanlon, J. F. 1989 A User's Guide to Vacuum Technology, 2nd Edition. New York, John Wiley & Sons: 401 p.Google Scholar
Slota, P. J. Jr., Jull, A. J. T., Linick, T. W. and Toolin, L. J. 1987 Preparation of small samples for 14C accelerator targets by catalytic reduction of CO. Radiocarbon 29(2): 303–306.Google Scholar
Turkdogan, E. T. and Vinters, J. V. 1974 Catalytic effect of iron on decomposition of carbon monoxide: 1. Carbon deposition in H2-CO mixtures. Metallurgical Transactions 5: 11–26.CrossRefGoogle Scholar
Vogel, J. S., Nelson, D. E. and Southon, J. R. 1987 14C background levels in an accelerator mass spectrometry system. Radiocarbon 29(3): 323–333.Google Scholar
Vogel, J. S., Southon, J. R. and Nelson, D. E. 1987 Catalyst and binder effects in the use of filamentous grapite for AMS. 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: 50–56.CrossRefGoogle Scholar
von Reden, K. F., Jones, G. A., Schneider, R. J., McNichol, A. P., Cohen, G. J. and Purser, K. H. 1992 The new National Ocean Sciences Accelerator Mass Spectrometer Facility at Woods Hole Oceanographic Institution: Progress and first results. Radiocarbon, this issue.Google Scholar