That was my first thought when I saw the title. IIRC roughly 1/3 of pregnancies end within weeks, often before a woman is aware that she is pregnant, almost al

That was my first thought when I saw the title. IIRC roughly 1/3 of pregnancies end within weeks, often before a woman is aware that she is pregnant, almost always because of a genetic mutation. Given that, if the miscarriage rate is higher, that would indicate that there is indeed an impact, but that our genome is very good at preventing dangerous mutations from propagating. Another possibility is that error-correcting mechanisms are good enough to deal with whatever impact exposure to that level of radiation had. One hypothesis about meiosis and genetic recombination is that it serves as an error correcting process, where damaged genes on one chromosome can be repaired using corresponding genes from the other chromosome.