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High-Precision AMS 14C Results on TIRI/FIRI Turbidite

Published online by Cambridge University Press:  18 July 2016

Thomas P Guilderson ,
John R Southon  and
Thomas A Brown
Thomas P Guilderson
Affiliation:
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94551, USA. also at Department of Ocean Sciences, University of California-Santa Cruz, Santa Cruz, California 94596, USA.
John R Southon
Affiliation:
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94551, USA. now at Department of Earth System Sciences, University of California-Irvine, Irvine, California 92967, USA.
Thomas A Brown
Affiliation:
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
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Abstract

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Unleached aliquots of TIRI/FIRI turbidite were analyzed by accelerator mass spectronomy (AMS) over a timespan of 18 months. Individual analyses ranged from 18,090–18,245 yr BP with reported errors between 30–50 yr. The weighted average fraction modern (FM) of these 28 measurements is 0.10378 ± 0.00008 (which equates to 18,199 ± 8 yr BP) and the measurements show a 1 standard deviation scatter of 0.00044 (±35 yr). The fractional error of these results indicates reproducibility of individual measurements at the 4 (1σ) level, which is consistent with the quoted counting-statistics-based errors. Laboratories engaged in the determination of 14C results at reasonably high precision should consider taking advantage of the TIRI and FIRI sample materials in the role of process standards. Additional suites of high-precision data are necessary to refine the accuracy of these sample materials.

Type
Calibration
Information
Radiocarbon , Volume 45 , Issue 1 , 2003 , pp. 75 - 80
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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