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Precise Comparison of 14C Ages from Choukai Jindai Cedar with IntCal04 Raw Data

Published online by Cambridge University Press:  18 July 2016

Kayo Suzuki*
Affiliation:
Graduate School of Science and Engineering, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan.
Hirohisa Sakurai
Affiliation:
Graduate School of Science and Engineering, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan. Department of Physics, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan.
Yui Takahashi
Affiliation:
Graduate School of Science and Engineering, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan.
Taiichi Sato
Affiliation:
Graduate School of Science and Engineering, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan.
Shuichi Gunji
Affiliation:
Department of Physics, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan.
Fuyuki Tokanai
Affiliation:
Department of Physics, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan.
Hiroyuki Matsuzaki
Affiliation:
Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.
Yoko (Sunohara) Tsuchiya
Affiliation:
Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.
*
Corresponding author. Email: kayo@ksprite.kj.yamagata-u.ac.jp.
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Abstract

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We measured the radiocarbon ages of 165 single-year tree rings from a Japanese Choukai Jindai cedar using accelerator mass spectrometry (AMS). By wiggle-matching the Choukai_AMS data set to the IntCal04 calibration data using OxCal v 3.10 and using the variation of the correlation coefficients between the Choukai_AMS and IntCal04 data sets, we precisely re-estimated that the 321 Choukai Jindai cedar tree rings range from 780 to 460 cal BC with an accuracy of 8 yr. The Choukai_AMS data set is older than the 3 raw data sets of European tree rings that comprise IntCal04. The Belfast and Seattle data sets are younger by −21.3 ± 5.5 and −22.7 ± 5.6 14C yr, respectively. The Choukai Jindai cedar is ∼22 14C yr older than the European tree rings, which is equivalent to an offset of −2.8‰ in 14C. In addition, the Choukai_AMS data set correlates well with the Belfast and Seattle data sets, with correlation coefficients of 0.89 and 0.68, respectively, between the temporal profiles. Hence, the temporal profile of the Choukai 14C ages shows a global variation.

Type
Calibration
Copyright
Copyright © The American Journal of Science 

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