Epidemiologic studies of atomic bomb survivors exposed in utero have provided conclusive evidence of a dose-dependent increase in the incidence of severe mental retardation for fetal doses greater than approximately:

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Studies have shown that fetal doses greater than approximately 0.4 Sv are associated with a dose-dependent increase in the incidence of severe mental retardation among atomic bomb survivors exposed in utero.

Epidemiologic Studies of Atomic Bomb Survivors Exposed in Utero Have