Plutonium traces found in Iitate soil

Kyodo Saturday, Oct. 1, 2011  japantimes

Plutonium has been detected at six locations in Fukushima Prefecture, including Iitate village around 45 km northwest of the Fukushima No. 1 nuclear plant, which suffered three reactor meltdowns after the March 11 earthquake and tsunami, science ministry officials said.

It is the first time the government has confirmed the spread of plutonium outside Tokyo Electric Power Co.'s stricken plant. The plutonium turned up in soil samples.

The detected amounts of plutonium were small and posed no danger to health, the officials said.

Plutonium has an extremely long half-life and is associated with a high risk of cancer if it enters the human body via breathing or other means.

"Because the fuels (in the reactors) melted down, plutonium may have been emitted with steam or other small particles and sent airborne," a Tepco official said. "(Judging by the amount of plutonium) it is believed to be from the accident."

The science ministry has also looked into radioactive strontium and detected the isotope at several dozen observation sites out of 100 it inspected, including a location about 80 km from the Fukushima plant.