Atmospheric nuclear weapon test history as characterized by the deposition of <14>^C in human teeth

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  • ヒト歯牙コラーゲン中<14>^C蓄積と大気圏内核実験との相関

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Abstract

The ^<14>C concentration in the collagen of human teeth was retrospectively investigated to determine whether its incorporation was related to atmospheric testing of nuclear weapons. Teeth were extracted for dental therapy from a July 1987 to February 1988 from patients who were residents in Japan. Tooth collagen was extracted with HCI and converted to amorphous C by heating in a vacuum line. Specimens for ^<14>C analysis were prepared by mixing the amorphous C with silver powder. The ^<14>C concentration was measured by mass spectrometer. The ^<14>C concentration in tooth collagen rapidly increased in 1961 after the bomb tests, peaked around 1967-1968,and then gradually decreased. The collagen of human teeth maintains the ^<14>C concentration at the age of root completion for life. The results of this study indicate that the history of environmental contamination from atmospheric nuclear weapon's tests has been characterized by the deposition of ^<14>C in the tooth collagen ^<14>C of human beings.

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