My problem with radiation: the units of exposure are so clumsy. We should have standardized on nanoSieverts as the main unit. The normal background radiation is 200 nSv per hour, and you get acute radiation sickness at 1_000_000_000 nSv. The lethal dose is 5_000_000_000. It really puts things into perspective.

E.g. even 10x the normal background is still ridiculously low.

Also, the LNT model is good enough. It's really the most conservative model that we have, so it makes sense to keep using it. We just need to quantify the risk increases properly.

I don't understand the relevance of the normal background level. The natural background level of mercury is many orders of magnitude below the level that causes acute mercury poisoning. That tells me absolutely nothing about the risks of mercury exposure from industrial activity or accidents.