Those most powerfully affected are pregnant women, children, women generally, the elderly, men and (least of all) the physically fit. Some persons appear to be invulnerable to exposure, but a significant percentage–from 47.7% to 57.7%–appear to be especially vulnerable, even from most of us might have regarded as low doses that represent minimal risk. The situation, however, turns out to be quite the opposite.
The human female is born with 400,000 follicles of which approximately 400 will eventually mature into eggs with the potential to be fertilized by sperm to produce a zygote, which will develop into an embryo and then into a fetus and, under favorable conditions, will result in a live birth. During the first 4-6 weeks of a woman’s pregnancy, the embryo is most vulnerable, especially because the woman may be unaware that she is pregnant and take no precautions.