[Effects of small doses of ionizing radiation on embryonic development of the mouse].

Mice with vaginal plugs were irradiated, seven hours after mating, i.e near fecundation, by 5, 10 and 25 rads of gamma rays from a 60Co source. Females were sacrificed on the 18th day of gestation. The total number of implantations was unchanged after exposure to 5 and 10 rads but the frequency of resorptions was increased for all doses. No abnormalities were observed in testicles, kidneys and skeleton.