On September 30, 1999, an accident at a uranium-processing facility in Tokaimura, 70 miles northeast of Tokyo occured. The accident was triggered when the three workers used too much uranium to make fuel and set off an uncontrolled atomic reaction.

A total of 439 people, including nearby residents, were believed to have been exposed to radiation. There were two fatalities.

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National Science FoundationNational Science Digital LibraryNuclear Pathways Member SiteThis project is part of the National Science Digital Library and was funded by the Division of Undergraduate Education, National Science Foundation Grant 0434253