An aerial radiation survey of the capital and Kanagawa Prefecture has revealed the northwest tip of Tokyo was tainted by an unusually high amount of fallout [... in] the mountainous Okutama region on Tokyo's western fringe. Radiation readings in the area were the highest of the two prefectures at 100,000 to 300,000 becquerels of radioactive cesium per square meter.
The hourly radiation readings in the area hovered between 0.2 and 0.5 microsievert, but a few spots had higher levels between 0.5 and 1.0 microsieverts, science official Hirotaka Oku said.
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