title: Directional distribution of radiation around an accident at a uranium fuel factory in Tokai-mura, 1999.
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.
authors.affiliation: Research Institute for Radiation Biology and Medicine, Hiroshima University Kasumi 1-chome, Hiroshima 734-8553, Japan. jtakada@hiroshima-u.ac.jp
authors.forename: J
authors.initials: J
authors.lastname: Takada
authors.forename: S
authors.initials: S
authors.lastname: Suga
authors.forename: K
authors.initials: K
authors.lastname: Kitagawa
authors.forename: M
authors.initials: M
authors.lastname: Ishikawa
authors.forename: S
authors.initials: S
authors.lastname: Takeoka
authors.forename: M
authors.initials: M
authors.lastname: Hoshi
authors.forename: H
authors.initials: H
authors.lastname: Watanabe
authors.forename: A
authors.initials: A
authors.lastname: Ito
authors.forename: N
authors.initials: N
authors.lastname: Hayakawa
mesh_terms: D006801:Humans; D007221:Industry; D007564:Japan; D011834:Radiation Monitoring; D018788:Radioactive Hazard Release; D014501:Uranium
chemical_list: D014501:Uranium