High levels of cesium isotopes are cropping up in dust at 42 incineration plants in seven prefectures, including Chiba and Iwate, an Environment Ministry survey of the Kanto and Tohoku regions shows.
According to the report, released late Saturday, the highest cesium levels in the dust ranged from 95,300 becquerels in Fukushima Prefecture and 70,800 becquerels in Chiba Prefecture to 30,000 becquerels in Iwate Prefecture.
But even the lower levels in the dust exceeded 8,000 becquerels per kilogram in Ibaraki, Tochigi, Gunma and Tokyo.
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