The exposure limits are based on the number of cancers from Fukushima, Nagasaki, and Hiroshima, them extrapolated down to tolerable population limits (reduce exposure until signal is below background). A multiplier was added in to account for the fact that radiation workers (x-ray techs, power plant staff, etc) are at far more risk of slipping above background than the general public.
The noise is non-trivial: 1 in 4 Americans will be diagnosed with cancer at some point.
The noise is non-trivial: 1 in 4 Americans will be diagnosed with cancer at some point.