400 millisieverts per hour was observed on the 4th machine.

Doses of radiation rise abnormally on March 15, and recovery efforts are extremely difficult situations in the first nuclear power plant of Tokyo Electric Power Company Fukushima (Fukushima Prefecture Okuma-cho and Futaba town) where damage was received due to a East Japan great earthquake.

Because man cannot enter within the enclosure of the fourth machine to which the explosion occurs, Tokyo Electric Power Company requests the helicopter to water from the sky to the U.S. military.

When the worker of Tokyo Electric Power Company investigated the building with the fourth machine that exploded on the 15th, two holes of about eight meters in the diameter were open on the wall in the northwest in the reactor building of the fourth machine according to the Tokyo Electric Power Company Fukushima office.

When the worker entered the building, and measured the radiation on the fourth floor, a high value of 400 millisieverts or less per hour was observed.

When 500 millisieverts are bathed in, a decrease of the lymphocyte in blood may occur.

The Fukushima nuclear accident corresponds to "Level 6" that follows Chernobyl nuclear accident (Level 7) in International Nuclear Event Scale according to the announcement of the chairman of France Nuclear Safety Commission on the 15th.

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