| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 8043083 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2013 | 6 Pages |
Abstract
We present the improved performance of the modified in situ cosmogenic 14C extraction system at ETH Zürich. Samples are now processed faster (2Â days in total) and are measured with a high analytical precision of usually <2% using the gas ion source of the MICADAS AMS facility. Measurements of the PP-4 standard sample show a good reproducibility and consistency with published values. Procedural blanks are very low at currently â¼4.0Â ÃÂ 10414C atoms. Analyses of samples from a â¼300Â year old rock avalanche prove that we can successfully apply in situ14C exposure dating to very young surfaces. Additionally, we present a modified calculation scheme for in situ14C concentrations which differs from that used for conventional radiocarbon dating. This new approach explicitly accounts for the characteristics of in situ14C production.
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Authors
K. Hippe, F. Kober, L. Wacker, S.M. Fahrni, S. Ivy-Ochs, N. Akçar, C. Schlüchter, R. Wieler,