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The water that men working at Japan’s Fukushima nuclear power plant were exposed to had thousand times the quantity of radiation normal for that facility, said Hidehiko Nishiyama, an official of the Japanese industrial and nuclear safety agency. He also said that the contamination was likely from the core of the No.3 reactor. According to Nishiyama, there is a possibility of a leak of some sort, perhaps from a breakage in the unit’s containment vessel. The report has raised concerns over the measures to control radiation as over 500 people, including firefighters and government authorities, continued to work there on Friday.