[acidburnNSA]

The models we use to guess dose vsm health are linear with no threshold and we chose this to be conservative in lieu of real low dose data. Since then there has been zero conclusive evidence that low dose radiation causes any harm at all. The people who live in very high natural background level areas have never been shown to have higher incidence of anything that could be linked to the radiation. The body has error correcting repair mehcanisms that can handle a lot.