> the amount of radiation you are exposed to does accumulate its negative affects What kind of radiation? If you mean ionizing radiation, the evidence, as far

> the amount of radiation you are exposed to does accumulate its negative affects What kind of radiation? If you mean ionizing radiation, the evidence, as far as I know, is mixed; some indicates there is buildup over time, some indicates that there are threshold effects and single doses below threshold, separated in time, do not accumulate. We do have lifetime dose limits as well as single exposure dose limits for such radiation because the evidence is mixed and we can't rule out that there are accumulation effects. But if you mean non-ionizing radiation, such as is used in the millimeter wave security scanners, there is no evidence of accumulation of effects over time from low doses (i.e., doses that do not cause immediate harmful effects) that I'm aware of. Do you know of any?