Abstract
The atmospheric carbon-14 (14C) concentration remained relatively stable until 1955, but then rapidly increased after 1955 by nuclear bomb tests, peaked in 1963, and decreased thereafter. Recently, Spalding et al. proposed epoch-making method for determining date of birth (DOB) using the tooth enamel 14C incorporated during enamel formation. However, because the 14C level analyzed in one tooth gives two possible age ranges (up-slope or down-slope of the bomb curve), a variety of teeth that formed in different periods are required for estimating DOB in this method. Enamel formation in a tooth moves from the incisal (occlusal) side to the cervical side. Taking advantage of this characteristic, we have first succeeded in specifying the age range from only single tooth by measuring 14C in the incisal (occlusal) and cervical regions of the enamel separately. To date, no method of determining DOB or age estimation from single tooth enamel has been made. Furthermore, this method of dividing tooth into smaller parts could be useful for producing a more accurate DOB. Our new method is a powerful tool for identification when we can use only extremely few specimens in forensic casework.
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Acknowledgements
This work was supported by Paleo Labo Co. (Toda, Japan). We thank Dr. Koichi Kobayashi for his assist with data analysis of this study.
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Kondo-Nakamura, M., Fukui, K., Matsu’ura, S. et al. Single tooth tells us the date of birth. Int J Legal Med 125, 873–877 (2011). https://doi.org/10.1007/s00414-010-0521-x
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DOI: https://doi.org/10.1007/s00414-010-0521-x