Do you have a link to an article about the children with three hands? It's an unusual deformation in newborns, but I think it's not related to radiation.

Radiation is bad and is especially bad for small children and unborn children, but it can produce only certain types of deformations. The number of hands in a baby is fixed after the 4th week after fertilization. ( https://en.wikipedia.org/wiki/Prenatal_development )

I also found this article: http://abcnews.go.com/Health/story?id=2021142

> Most cases of multiple limbs result from conjoined twins forming in development. One child does not survive and becomes essentially absorbed into the other, said Dr. Russell Jennings at the Children's Hospital in Boston.