| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 8043459 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2013 | 5 Pages |
Abstract
Oak tree rings from Southern Germany covering the AD 1010-1110Â years have been analyzed for radiocarbon with accelerator mass spectrometry (AMS) at the laboratory at ETH Zurich. High-precision measurements with a precision down to 12Â years radiocarbon age and a time resolution of 2Â years aimed to identify modulations of the 14C concentration in tree ring samples caused by the 11Â years solar cycles, a feature that so far is not visible in the IntCal calibration curve. Our results are in good agreement with the current calibration curve IntCal09. However, we observed an offset in radiocarbon age of 25-40Â years towards older values. An evaluation of our sample preparation, that included variations of e.g.: chemicals, test glasses and processing steps did not explain this offset. The numerous measurements using the AMS-MICADAS system validated its suitability for high precision measurements with high repeatability.
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Authors
D. Güttler, L. Wacker, B. Kromer, M. Friedrich, H.-A. Synal,