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Originally Posted by troutman
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The last source you have there doesn't seem to be supporting no proven risk, rather a high level of uncertainty in the dose-response at low levels (which is quite common). From an admittedly quick read the conclusion seems to be that above 1000 Bq/m3 there is sufficient evidence of a health risk, but there is a lot of debate about whether the linear non-threshold dose response model really holds at lower doses. I deal more with chemical carcinogens than radiological but I see that same debate over and over. At the end of the day when protecting public health when there's uncertainty we tend to err on the conservative side and assume the linear non-threshold dose response model holds until there's clear evidence that it doesn't.