Tokaimura accident: Neutron dose estimates from 5-yen coins

@article{Kohno2000TokaimuraAN,
  title={Tokaimura accident: Neutron dose estimates from 5-yen coins},
  author={Masuchika Kohno and Yoshinobu Koizumi},
  journal={Nature},
  year={2000},
  volume={406},
  pages={693-693}
}
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… 
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