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14C Age Measurements of Single-Year Tree Rings of Old Wood Samples 22,000 14C Years BP

Published online by Cambridge University Press:  18 July 2016

Taiichi Sato ,
Hirohisa Sakurai ,
Kayo Suzuki  and
Yui Takahashi
Taiichi Sato
Affiliation:
Graduate School of Science and Engineering, Yamagata University, 1-4-12 Kojirakawa, Yamagata City, Yamagata 990-8560, Japan
Hirohisa Sakurai*
Affiliation:
Graduate School of Science and Engineering, Yamagata University, 1-4-12 Kojirakawa, Yamagata City, Yamagata 990-8560, Japan Department of Physics, Yamagata University, 1-4-12 Kojirakawa, Yamagata City, Yamagata 990-8560, Japan
Kayo Suzuki
Affiliation:
Graduate School of Science and Engineering, Yamagata University, 1-4-12 Kojirakawa, Yamagata City, Yamagata 990-8560, Japan
Yui Takahashi
Affiliation:
Graduate School of Science and Engineering, Yamagata University, 1-4-12 Kojirakawa, Yamagata City, Yamagata 990-8560, Japan
*
Corresponding author. Email: sakurai@sci.kj.yamagata-u.ac.jp
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Abstract

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Radiocarbon ages of single-year tree rings were measured for Kaminoyama wood samples using accelerator mass spectrometry (AMS) in 2 Japanese facilities, MALT and JAEA, in order to investigate the periodic variation of 14C concentrations relating to the 11-yr solar cycle near 26,000 yr BP. Eight sequential measurements of 14C ages were carried out for a set of 13 alternate single-year tree rings covering 26 yr. Averages of the 5 data sets in MALT and 3 data sets in JAEA were 22,146 ± 50 and 22,407 ± 58 14C yr BP, respectively, indicating an offset of 260 ± 77 14C yr. Multiple sequential measurements are advantageous for evaluating offsets. The standard deviation of the residuals of 14C ages from the averages in each data set was 118 14C yr, in contrast to that of 234 14C yr for the combined data sets due to an elimination effect in the offsets. The profiles of weighted mean values for the residuals of 14C ages showed similar enhancements with a width of ∼12 yr for measurements in the 2 facilities. This indicates the reproducibility of the multiple sequential measurements. In the profile for the combined 8 data sets, the 14C enhancement was 73 ± 36 14C yr from the average.

Type
Calibration, Data Analysis, and Statistical Methods
Information
Radiocarbon , Volume 52 , Issue 3: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 901 - 906
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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