Yokohama finds high strontium-90 levels via The Japan Times Online

YOKOHAMA — Radioactive strontium exceeding normal levels has been detected in sediment from atop an apartment building in Yokohama, some 250 km from the Fukushima No. 1 nuclear power plant, city officials said Wednesday.

While the discovery of 195 becquerels of strontium-90 in the rooftop sediment fueled concerns that leaked radiation may have spread farther than the central government expected, the officials said the city is carefully examining where the isotope came from.

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