shadron
Philosopher
- Joined
- Sep 2, 2005
- Messages
- 5,918
Deniers have already started spreading the "news" that some places in the world have naturally high background radiation, and that 20 mSv/yr isn't actually that bad.
Actually, that's happens to be true, at least the first part. Semipalatynsk is not a safe area to live in right now; perhaps you can imagine why. But do you know which state has the highest natural radiation background?
Not to leave you in suspense, it is Iowa. Why? Because the soil of the state started life as granite layers of rock in Canada. It was conveniently ground up and dragged to Iowa, free of charge. Unfortunately, the granite had a substantial load of uranium ores in it, and now Iowa is your radon field of dreams.
That's not an isolated story. Granite often contains uranium salts, as does lignite coal. So, yes, there are areas in the world which are more naturally radioactive than others. That has been obvious to geologists since at least the 1930s.