A good chuck of the desert southwest of the US is naturally radioactive due to exposed uranium. It just sits out on the ground.
Then there is Aberdeen Scotland. The town is built out of radioactive granite. Supposedly, its safe.
The whole Earth is radioactive. Humanity keeps marching on.
As bad as Fukushima was, I worry much more about a asteroid strike or the Sun becoming unstable than that.
I don’t worry much about that stuff because there is little chance that it will happen in my lifetime and there is nothing I can do to stop it anyway.
I don’t worry about radiation because life grew up around it and I figure since life is still here it learned to deal with it as a matter of course.
The Earth was much more radioactive billions of years ago when life got started it had to have mechanisms to overcome the damage. Sure those repair mechanisms don’t always work but that’s life.
The evidence of Chernobyl, Hiroshima and several other accidents all show that low level chronic radiation has no statistically discernible adverse effects on health. Some studies actually show a benefit to health.