Yokohama finds high strontium-90 levels

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.

If the substance is from the Fukushima plant, it will be the first time strontium at a concentration of more than 100 becquerels per kilogram has been found beyond 100 km from the troubled plant

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