Earlier quoted context omitted.
Ah, the linear no threshold theory of radiation. If background radiation is everywhere , how can there be no safe dose . It’s a fun analogy, but reinforces an incorrect assumption.
Can’t it be like playing Russian roulette with a gun that has billions of chambers? The gun is always unsafe, but you will probably be fine? The higher the level, the more full chambers?
The risk of dying increases linearly with the number of bullets you load.
A different model suggests that very low levels are either benign or even helpful.