Density of Nuclear Radioactivity in Fukushima, Tokyo, Japan

Tokyo Electric Power Co. <9501> has corrected data on radioactivity levels in a turbine building at its tsunami-stricken nuclear power plant in the northeastern Japan prefecture of Fukushima.

In early Sunday afternoon, the company said that 2.9 billion becquerels of radioactive substances per cubic centimeter have been found in a puddle of water in the basement of the turbine building for the Fukushima No. 1 nuclear plant’s No. 2 reactor. The figure is some 10 million times as high as the radioactivity level in water inside a reactor core in operation, according to the company.

Tokyo Electric Power based the finding on the level of radioiodine-134.
But a re-examination of the sample of water collected on Saturday found no radioiodine-134, the company said. The density of radioactivity was corrected to 100,000 times the level in an operating reactor core.

Tokyo Electric Power Executive Vice President Sakae Muto said at a news conference Sunday night that the radioactivity level announced initially was wrong, noting that the company took data on cobalt-56 for those on iodine-134.

Leave a Reply