Gov't updates radiation maps with data on six new prefectures
The government has released soil radiation maps covering a much broader swath of Japan than previous releases, covering six new prefectures.
The newly included prefectures are Iwate, Yamanashi, Nagano, Shizuoka, Gifu, and Toyama.
Areas contaminated with 30,000 to 100,000 becquerels of radioactive cesium per square meter were found in the municipalities of Ichinoseki and Oshu in Iwate Prefecture, Saku, Karuizawa, and Sakuho in Nagano Prefecture, Tabayama in Yamanashi Prefecture, and elsewhere.
The measurements were taken by helicopter and combine contamination with both cesium-134 and -137, which have half-lives of two and 30 years, respectively.
(Mainichi Japan) November 12, 2011