Abstract
Radiocarbon dating with the Gif-sur-Yvette Tandetron accelerator has been routinely performed since the middle of 1985. Samples are prepared by direct catalytic reduction of CO 2 on iron powder with typically 1 to 2 mg of carbon. 12C, 13C and 14C isotopes are measured after acceleration for the direct correction of 14C ages for natural and preparation induced fractionation. The precision and the reproducibility of the 14C activities obtained for samples younger than 5 000 yr BP is close to 1%. Our background is limited by contamination in sample preparation i.e. pretreatment and catalytic reduction. The contamination due to catalytic reduction of CO 2 samples, between 1 to 2 mg of carbon has a typical value of (0.25 ± 0.11)% of modern.
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