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Accurate Age Estimation Using 14C Content in Japanese Human Teeth

Published online by Cambridge University Press:  20 February 2017

Keisuke Kunita ,
Toshio Nakamura  and
Kazuo Kato
Keisuke Kunita
Affiliation:
Division of Chronological Research, Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
Toshio Nakamura*
Affiliation:
Division of Chronological Research, Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
Kazuo Kato
Affiliation:
School of Dentistry, Aichi Gakuin University, 1-100, Kusumoto-cho, Chikusa, Nagoya 464-8650, Japan
*
*Corresponding author. Email: [email protected].
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Abstract

We investigated age estimation of persons using 45 Japanese human teeth that consisted of mainly the third molar. We measured the radiocarbon content in tooth enamel hydroxyapatite from the crown as well as those in collagen and bioapatite in the root of the same tooth. Age estimations from tooth enamel apatite yielded an absolute age shift of 1.7±1.4 yr from the true age. This value suggests that estimating the age of Japanese people from tooth enamel is as accurate as the previous studies conducted in Europe and the USA. The 14C analysis of roots suggested that bioapatite is formed slightly later than collagen in the same tooth roots. The appropriate formation age ranges suggested by the tooth enamel analysis can be optimized and confirmed by using the additional F14C values of the root samples. We also noticed a characteristic trend of enamel δ13C values in comparison with the formation ages of the crowns of the teeth. The δ13C value tends to increase gradually from –13.0‰ to –11.5‰ from the 1960s to the 1970s, probably being caused by changes in the Japanese diet. This trend may support the selection of proper tooth formation age as supplemental data in addition to 14C content analyses.

Keywords

radiocarbonhuman toothforensic sciencedate of birthtooth enamel
Type
Chemical Pretreatment Approaches
Information
Radiocarbon , Volume 59 , Special Issue 3: Proceedings of the 22nd International Radiocarbon Conference (Part 2 of 2) , June 2017 , pp. 739 - 756
Copyright
© 2017 by the Arizona Board of Regents on behalf of the University of Arizona 

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Footnotes

Selected Papers from the 2015 Radiocarbon Conference, Dakar, Senegal, 16–20 November 2015

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