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A Preliminary Determination of the Absolute 14C/12C Ratio of OX-I

Published online by Cambridge University Press:  18 July 2016

M L Roberts  and
J R Southon
M L Roberts*
Affiliation:
National Ocean Sciences AMS Facility, Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA
J R Southon
Affiliation:
Keck Carbon Cycle AMS Laboratory, Department of Earth System Science, University of California, Irvine, Irvine, California 92697, USA
*
Corresponding author. Email: mroberts@whoi.edu
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Abstract

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A preliminary determination of the absolute 14C/12C ratio of the oxalic acid I standard (NBS SRM 4990B) has been made. Using an accelerator mass spectrometry (AMS) system, a known number of radiocarbon ions were implanted in a thin copper foil. The foil was then combusted with the addition of 14C-free carrier material. This resulting gas (which had a known 14C/12C ratio) was graphitized and compared to OX-I material. This comparison yielded an absolute 14C/12C ratio of OX-I. The absolute 14C/12C ratio of OX-I, coupled with knowledge of the specific activity of OX-1, provides an alternative determination of the 14C half-life.

Type
Articles
Information
Radiocarbon , Volume 49 , Issue 2 , 2007 , pp. 441 - 445
Copyright
Copyright © 2007 by the Arizona Board of Regents on behalf of the University of Arizona 

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