Table 1.

Fetal risk caused by ionizing radiation, according to the dose and term of pregnancy.

	0–100 mGy	100–500 mGy	>500 mGy
0–2 WG	Death of the embryo
2–8 WG	No demonstrated effects	Risk of malformation
8–24 WG	No demonstrated effects	Risk of reducing intellectual abilities	High risk of mental retardation
24–39 WG	No demonstrated effects	Decrease of all determinist side effects

Abbreviations: mGy = miliGray, WG = week of gestation.