Abstract
For 14C dating of ice, only a limited amount of CO 2 is available (20–100 μgC/kg ice). To avoid contamination, a special milling device has been constructed to chip the ice at − 20 °C. The background of 7.0 ±2.0 percent modern carbon (pmC) for a sample of 50 μgC, including extraction and conversion, limits the 14C dating of ice with accelerator mass spectrometry (AMS) to about 20000 years B.P. Results are presented for an ice core from the Pakitsoq area, West Greenland, with a known age of 9000 ±1000 yrs B.P., established by means of δ 18O variations and ice flow model calculations.
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