Stewart estimated that an in utero irradiation of 10-20 mGy increases the risk of cancer in the child by 1.5-2 (Stewart 1973). Harvey et al. (1985), who studied twin pregnancies subjected or not subjected to diagnostic radiation averaging 1 cGy, evaluated the relative risk at 2.4. However, this risk continues to be debated. It is surprising to note that the risk of radiation-induced cancer is higher when the radiation is received at the end of pregnancy rather than just after birth (Miller 1995). In addition, the tumors observed in children are more of the embryonic type, which does not correspond to tumors known to be radiation-induced.
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