Abstract

Pilot-tests were carried out on the effect of low X-ray doses (0, 2, 4, 8, 12, 16 and 32 rad) and age of females on intra-uterine death. The tests included the effects of various ages of females at exposure, of fractionated irradiation and pre-partal exposure. Females and males were taken from our inbred CBA strain. Virgin females, as well as females that had produced some litters, were used. From the results it is obvious that the age of the females at the time of mating had a considerable effect on the death rate (varying from about 8% in young females to 25–30% in old ones). The low-dose X-ray exposure does not seem to have had any detectable influence on the rate of intra-uterine death.

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