This is a school 50 kilometers northeast of Tokyo, in a city called Moriya.
A local citizens' group recently carried out examinations on 85 children under the age of 18 and found out that 58 of them, or 70 percent had radioactive cesium in their urine samples.
The kind of cesium detected is a fission product formed in nuclear power plants.
Members of the group say there's a high chance the cesium entered the children's bodies after eating food contaminated with radioactive material.
While the nuclear concerns spread throughout Japan, the Tokyo Electric Power Company is trying to contain radioactive leaks at the crippled Fukushima Nuclear Power Plant.
TEPCO said Thursday that another tank at the plant is leaking radioactive water into the Pacific Ocean.
This is a different tank from the one that was found to have been leaking 300 tons of contaminated water back in August.
TEPCO said that workers detected water dripping from the top of an overflowing tank,.. and estimated that about 430 liters had leaked into the sea via a ditch next to the concrete barrier.
Yoo Li-an, Arirang News.