National Institute of Radiological Sciences (NIRS) recalculated the exposure dose of children in Fukushima and concluded that part of children were in fact exposed to radiation to a certain extent although the government informed that their exposure dose was "0mSv" in January 2012. The recirculation of NIRS is based on the same government investigation of 1080 children in Fukushima conducted in August 2011, but age and condition of children are added up to calculate their life time exposure dose. Although the government concluded then that 55% of children were not exposed at all, this research of NIRS revealed the average exposure dose was 12mSv, the maximum 42mSv and at least 4 children whose life time expose dose was above 30mSv. The government claimed that the research was a simplified form of investigation to judge weather or not they should provide Iodine tablet. (The standard exposure dose of the International Atomic Energy Agency (IAEA), which the Japanese government is relying on when providing Iodine tablet to prevent pediatric thyroid cancer, is 50mSv.) Additionally, the government research included the result of "below the detection limit of Geiger counter" into the category of "0mSv". Nuclear Safety Commission called for the additional research of Fukushima children in the late March 2011, but the government refused the request as the result would upset general public. The government is also not planning to take this research of NIRS as an official document to inform since this is a private investigation.
Asahi Shinbun Newspaper 11, 07, 2012