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A high level of radioactive substance was detected in late March,

A high level of radioactive substance was detected in late March, the ash from an incinerator and sewage plants discovered in Tokyo, announced Saturday, the Japanese media.
Ash, which contains an unidentified substance with a high level of radioactivity (170 000 becquerel per kilogram) was detected in sewage plants of the Koto, located east of the capital of Japan, Nikkei and Sankei newspapers said, quoting sources close to the local authorities .

Ashes from the incineration of inorganic waste.

A substance that emits a radioactive level 100000-140000 becquerel per kilogram was detected in two water treatment plants in the sectors of Ota and Itabashi, all in late March after the accident in Fukushima.

Researchers trying to determine whether the substance could be cesium.

Japan is facing more than two months, the worst nuclear accident in history, after the Fukushima Daiichi plant was damaged by the earthquake followed by tsunami on 11 March. The plant is located approximately 220 kilometir northeast of Tokyo.