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Neutron dose estimates from 5-yen coins

Author

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  • Masuchika Kohno

    (Kyoto University)

  • Yoshinobu Koizumi

    (Isotope Center, University of Tokyo)

Abstract

After a criticality accident at a nuclear-fuel processing facility in Tokaimura, Japan, at 10:35 Japanese standard time on 30 September 1999, neutron emission continued until early the next morning. To estimate the neutron dose to the surrounding population, we collected 5-yen coins (37 weight per cent zinc) from places likely to have been exposed to radiation as a result of the accident and determined the amount of 65Zn generated in them in the nuclear reaction 64Zn+n→65Zn by spectrometrically measuring the photons emitted by 65Zn. Our results indicate that people evacuated to 350 m outside the irradiated area still received a significant neutron dose.

Suggested Citation

  • Masuchika Kohno & Yoshinobu Koizumi, 2000. "Neutron dose estimates from 5-yen coins," Nature, Nature, vol. 406(6797), pages 693-693, August.
    • Handle: RePEc:nat:nature:v:406:y:2000:i:6797:d:10.1038_35021138
    DOI: 10.1038/35021138
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