A significant excess of the norms of radioactive cesium-137 were found in the tanks, which collects rainwater in 18 schools in the Japanese city of Yokohama, told Japanese media on Friday.
An inspection carried out by the city administration in 44 schools showed that in 17 of them the levels of cesium-137 in water and mud sediments in tanks, where rainwater collects sewage for the needs of schools, well above the state standard in 8000 becquerels per kilogram. Maximum level in one of the schools was 16.8 thousand becquerels per kilogram.
In this case, the cesium-137 in the water in school toilets, according to testing, were found. Despite this, at the direction of the local Board of Education, the use of water from the tank is temporarily suspended.
High levels of radioactive contamination was detected in tests conducted at the end of last year. Committee on Education of the city to give an explanation of why this information was not timely reported to the students' parents.
The accident at the nuclear power plant "Fukushima-1", the tsunami March 11, 2011, led to the leakage of radionuclides in soil, air and sea. Complete elimination of the consequences will take 30-40 years. From the area of 20-30 kilometers from the station was evacuated 140,000 people.