No adverse health effects among Fukushima residents have been documented that are directly attributable to radiation exposure from the March 2011 Fukushima-Daiichi accident and revised estimates suggest that future radiation-associated health effects are unlikely to be discernible, says a United Nations report.

The United Nations Scientific Committee on the Effects of Atomic Radiation (Unscear) report, which assesses information that has become available since a 2013 Unscear report, says a substantial number of thyroid cancers have been detected among exposed children.

However, the excess does not appear to be associated with radiation exposure, but rather a result of the application of highly sensitive ultrasound screening procedures that have revealed the prevalence of thyroid abnormalities in the population not previously recognised.