Association between radiation dose, thyroid hormone, and IQ levels in children exposed to radiation in utero after the Chernobyl accident.

We followed up persons exposed in utero to radiation from the Chernobyl accidentAmong the most highly exposed, IQ was higher among those exposed later during gestationAmong the most highly exposed, IQ also decreased with increasing level of dose and of T3No such relation was seen in those with lower exposureOur study provides insights into the possible relation between prenatal radiation dose and IQ and the factors which may modify it.