Monday, April 18, 2011

Robots report high radiation levels in damaged reactors

Remote-controlled robots and workers controlling them have recorded high levels of radiation inside and around two reactor buildings at the Fukushima Daiichi nuclear power plant, safety officials said Monday.

The U.S.-built robot probes measured radiation doses as high as 57 millisieverts inside the housing for reactor No. 3 and up to 49 millisieverts inside the No. 1 reactor building, Japan's Nuclear and Industrial Safety Agency reported. Levels found between the double doors of the airlocks of the reactor buildings were much higher -- 270 millisieverts in the case of reactor No. 1 and 170 millsieverts in No. 3, the agency said.

By comparison, the average resident of an industrialized country receives a dose of about 3 millisieverts per year. Emergency standards for plant workers battling the month-old nuclear disaster limit their annual exposure to 250 millisieverts, while a CT scan produces just under 7 and a chest X-ray delivers a one-time dose of about .05 millisieverts.

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