期刊
QUATERNARY GEOCHRONOLOGY
卷 19, 期 -, 页码 194-197出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.quageo.2013.01.004
关键词
In situ 14C; Cosmogenic nuclide; Surface exposure dating
资金
- Division Of Earth Sciences
- Directorate For Geosciences [1153689] Funding Source: National Science Foundation
We report on the status and capabilities of the Lamont-Doherty Earth Observatory in situ C-14 extraction laboratory. In late 2006 we began, in collaboration with the AMS group at the University of Arizona, construction of a new laboratory to extract in situ cosmogenic C-14 from terrestrial silicates. Long-term measurements of the process blank over the last two years give an arithmetic mean and standard deviation of 125 +/- 43 x 10(3) atoms C-14 (n = 9) and show significant improvement in the number of atoms, as well as stability compared to initial measurements of the process blank. We report long-term measurements of the intercomparison material CRONUS-A, which has been developed as part of the CRONUS-Earth effort to characterize inter- and intra-laboratory variability. We interpret the standard deviation (5%) of six replicate measurements of CRONUS-A as the reproducibility of in situ C-14 extractions in our laboratory. Published by Elsevier B.V.
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