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Report No.

A Study on dose evaluation for Tokaimura criticality accident termination

Kanamori, Masashi; Suto, Toshiyuki ; Tanaka, Kenichi*; Takada, Jun*

Verification of dose control method for Tokaimura JCO criticality accident was performed. Personal dose estimation for Tokaimura criticality accident termination was performed based on measurements of neutron and $$gamma$$ ray doses taken before the work commenced, but the personal dose for the workers as a result of the termination work was found to be approximately 50 times higher than the previous estimation. For this report, we reevaluated doses based on the results of close range measurements from 40 meters to 100 meters, and the results were found to match personal doses with an accuracy of between 60-80%.



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