Disaster

An assessment of the external and internal radiation exposure levels, which includes calcu-lation of effective doses from chronic radiation exposure and assessment of long-term radi-ation-related health risks, has become mandatory for residents living near the nuclear power plant in Fukushima, Japan. Data for all primary and secondary children in Minami-soma who participated in both external and internal screening programs were employed to assess the annual additional effective dose acquired due to the Fukushima Daiichi nuclear power plant disaster. In total, 881 children took part in both internal and external radiation exposure screening programs between 1st April 2012 to 31st March 2013. The level of addi-tional effective doses ranged from 0.025 to 3.49 mSv/year with the median of 0.70 mSv/ year. While 99.7 % of the children (n = 878) were not detected with internal contamination, 90.3 % of the additional effective doses was the result of external radiation exposure. This finding is relatively consistent with the doses estimated by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). The present study showed that the level of annual additional effective doses among children in Minamisoma has been low