High levels of radioactive cesium were found in an area near an elementary school in Yokohama and official levels have been registered over 6.85 uSv/hr. After investigation officials believe that the radiation accumulated in areas where air conditioning filters were washed from industrial complexes.
It is believed that the filters were washed with water and the radioactive materials were transferred to the ground around the area where the cleaning work was carried out. Decontamination work will be required, and officials will monitor levels of radiation in the soil around the affected areas. The city government sees the high radiation levels to be likely caused by the nuclear crisis at the Fukushima Daiichi power plant and plans to decontaminate the area, the officials said.
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- Kyodo: High levels of radioactive cesium detected in Yokohama south of Tokyo – 6.85 microSv/h close to elementary school (enenews.com)