Well, I've heard that. I think that by and large, even at 10 times what they claim, its pretty harmless BUT 1) they screwed up their safety tests, which is unacceptable and 2) if you are going to assume a linear connection between radiation and cancer, even at very low doses (as the NRC does) then you have to compare the risk, however small, to the risk, however small, of being killed by terrorists. Someone ran that math, and even at the does they SAY you are getting, the numbers don't look good.