Q. Where can I find research on mutations caused by radation?

Well... There are books on mutation related to radiation in the evolution section and the health section and in other places. How about, Radiation and human health by John W Gofman, San Francisco : Sierra Club Books, ©1981. or Chemical consequences: environmental mutagens, scientist activism, and the rise of genetic toxicology. If not either of those, you'll probably find some good articles about this topic by searching "radiation mutations" or some variant of that.