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Verification of the Cosmic-Ray Event in AD 993–994 by Using a Japanese Hinoki Tree

Published online by Cambridge University Press:  26 July 2016

Fusa Miyake ,
Kimiaki Masuda ,
Masataka Hakozaki ,
Toshio Nakamura ,
Fuyuki Tokanai ,
Kazuhiro Kato ,
Katsuhiko Kimura  and
Takumi Mitsutani
Fusa Miyake*
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan
Kimiaki Masuda
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan
Masataka Hakozaki
Affiliation:
Center for Chronological Research, Nagoya University, Nagoya, Japan
Toshio Nakamura
Affiliation:
Center for Chronological Research, Nagoya University, Nagoya, Japan
Fuyuki Tokanai
Affiliation:
Faculty of Science, Yamagata University, Yamagata, Japan
Kazuhiro Kato
Affiliation:
Faculty of Science, Yamagata University, Yamagata, Japan
Katsuhiko Kimura
Affiliation:
Faculty of Symbiotic Systems Science, Fukushima University, Fukushima, Japan
Takumi Mitsutani
Affiliation:
National Institutes for Cultural Heritage, Nara National Research Institute for Cultural Properties, Nara, Japan
*
2. Corresponding author. Email: fmiyake@stelab.nagoya-u.ac.jp.
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Abstract

A rapid yearly increase in the radiocarbon content has been detected for the period from AD 993 to 994. However, this event is supported by the 14C measurements of only one cedar tree sample, and verification is necessary to confirm this event more reliably. For this purpose, this study measured the 14C content in Japanese Hinoki tree rings corresponding to the period from AD 988 to 997 using the accelerator mass spectrometry system at Yamagata University (YU-AMS). The result shows a significant 14C increase from AD 993 to 994, and is consistent with the previously measured data for the Japanese cedar tree. This marks the second case detecting an increased 14C level corresponding to the AD 994 event.

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Type
Articles
Information
Radiocarbon , Volume 56 , Issue 3 , 2014 , pp. 1189 - 1194
Copyright
Copyright © 2014 by the Arizona Board of Regents on behalf of the University of Arizona 

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