A preliminary determination of the absolute 14 C/ 12 C 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 14 C-free carrier material. This resulting gas (which had a known 14 C/ 12 C ratio) was graphitized and compared to OX-I material. This comparison yielded an absolute 14 C/ 12 C ratio of OX-I. The absolute 14 C/ 12 C ratio of OX-I, coupled with knowledge of the specific activity of OX-1, provides an alternative determination of the 14 C half-life.
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Roberts et al. (2007) studied this question.
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