The Yomiuri Shimbun
Tokyo Electric Power Co. said it detected 10,300 millisieverts of radiation per hour in the basement of a building housing the No. 1 reactor of the crippled Fukushima No. 1 nuclear power plant, the highest radiation recorded in the plant's reactor buildings.
According to the utility's announcement Wednesday, it would take about 20 seconds for a worker exposed to this level of radiation to reach the government-set, annual cumulative dose limit of 50 millisieverts. Acute symptoms of radiation exposure such as vomiting would develop in about six minutes.
TEPCO said it needs to identify and repair spots where radiation-contaminated water is leaking in the building as it moves toward decommissioning the No. 1 reactor. The power company said such work will be difficult, as the high radiation makes it necessary to use robots instead of human workers.
The Daily Yomiuri
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