Tokyo: Over three millisieverts of radiation has been measured in the urine of 15 residents living near the Fukushima Daiichi Nuclear Power Plant, especially in the village of Litate and the town of Kawamata.
Both the places are about 30 to 40 kilometres away from the Fukushima No 1 power plant, which has been releasing radioactive material into the environment after being severely hit by the March 11 earthquake-cum-tsunami.
Nanao Kamada, professor emeritus of radiation biology at Hiroshima University, said that people need to stop eating contaminated vegetables or other products to avoid being affected by it.
"But it will be difficult for people to continue living in these areas," The Japanese Times quoted him, as saying.
Kamada teamed up with doctors, including few belonging to Watari Hospital in the city of Fukushima, to conduct two rounds of tests on each resident in early and late May by taking urine samples from 15 people between 4 and 77.
Radioactive caesium was found both times in each resident.
Radioactive iodine was found as high as 3.2 millisieverts in six people in the first survey, but none was found in the second survey.
The data indicates that the accumulated external exposure was between 4.9 and 13.5 millisieverts, putting the grand total between 4.9 to 14.2 millisieverts over about two months, the report quoted the researchers, as saying.
"The figures did not exceed the maximum of 20 millisieverts a year, but we want residents to use these results to make decisions to move," Kamada added.