PROGRESS IN C-14 DATING OF ICE AT UTRECHT

[摘要] For C-14 dating of ice, only a limited amount of CO2 is available (20-100-mu-g C/kg ice). To avoid contamination, a special milling device has been constructed to ship the ice at -20-degrees-C. The background of 7.0 +/- 2.0 percent modern carbon (pmC) for a sample of 50-mu-g C, including extraction and conversion, limits the C-14 dating of ice with accelerator mass spectrometry (AMS) to about 20 000 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 delta-O-18 variations and ice flow model calculations.

[发布日期] 1990-12-01

[效力级别]  Proceedings Paper