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IAEA: High level of iodine-131 outside zone
The agency did not give the name of the substance at its news conference on Wednesday.
The village of Iitate to the northwest of the plant is outside the 20 kilometer exclusion zone and the 20 to 30 kilometer alert zone where the Japanese government advises voluntary evacuation.
On Wednesday, the IAEA said radiation levels twice as high as its evacuation level were detected in Iitate and it had advised the Japanese government to carefully assess the situation. But it did not give details of the substance or who carried out the measurement.
The UN nuclear agency revealed on Thursday that its judgment was based on data obtained from the Japanese authorities.
Japan's Nuclear Safety Commission said it sees no reason to change the evacuation zone and advice to stay indoors as its criteria are based on how much radiation people would be exposed to, and not the radiation level in the ground.
The IAEA also corrected the reading of 2 million becquerels of iodine-131 per square meter it announced on Wednesday. The revised figure is 20 million becquerels per square meter.
The IAEA will continue analyzing radiation levels in cooperation with the Japanese government.
Iodine-131 has a radioactive half-life of 8 days, and the half-life of Cesium-137 is 30 years.
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