![]() ![]() "These typically occur in these kinds of criticality accidents." "The estimated doses for Ouchi were among the highest known, though I'm not sure if it's the highest," explains Lyman. Internet articles frequently describe Ouchi as ' the most radioactive man in history,' or words to that effect, but nuclear expert Lyman stops a bit short of that assessment. There have been various estimates of the exact amount, but a 2010 presentation by Masashi Kanamori of the Japan Atomic Energy Agency put the amount at 16 to 25 gray equivalents (GyEq), while Shinohara, who was about 18 inches (46 centimeters) away, received a lesser but still extremely harmful dose of about 6 to 9 GyEq and a third man, who was further away, was exposed to less radiation. Ouchi, who was closest to the reaction, had received a massive dose of radiation. But even so, the damage already had been done. The two workers quickly left the room, according to The Post's account. Nuclear Regulatory Commission report noted that before Tokaimura, 21 previous criticality accidents had occurred between 19. It wasn't the first time it had happened. If safeguards aren't carefully taught and followed, there's potential for "a devastating type of accident," Lyman says.
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