Journal of Radiation Research
Online ISSN : 1349-9157
Print ISSN : 0449-3060
Regular Papers
Directional Distribution of Radiation around an Accident at a Uranium Fuel Factory in Tokai-mura, 1999
JUN TAKADA, SHINJI SUGA, KAZUHIDE KITAGAWA, MASAYORI ISHIKAWA, SEIJI TAKEOKA, MASAHARU HOSHI, HIROMITSU WATANABE, AKIHIRO ITO, NORIHIKO HAYAKAWA
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Keywords: Tokaimura, Criticality accident, Radiation, Directional dependence, Residential areas
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2001 Volume 42 Issue 1 Pages 47-55

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Abstract

A beta-ray survey was carried out on concrete walls of the boundary and buildings after a criticality accident at a factory of JCO Co. Ltd. at Tokai-mura. A remarkable distribution of beta counts was observed on the walls depending on the complex internal and external structures of buildings surrounding a precipitation vessel containing uranium 23 days after the accident. The directional distribution function, based on the beta counts on the walls, was consistent with data concerning the neutron dose rate measured in several directions during the accident, suggesting an anisotropic neutron distribution to the residential area.

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© 2001 by Journal of Radiation Research Editorial Committee
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