I know it looks like a lot of topics but hear me out here. I am not talking about some nonsense explanation for this ability but more of an evolutionary process.
Imagine that for numerous generations some humans survived in radioactive areas, over the years (I mean a looooooot of years) their capacity for regeneration evolved to counter cellular degradation.
Also, but I am venturing on a path I know less, could it be they have some way of never losing fragments of DNA (meaning nothing or very little is lost with each new cell created)?
So basically they would look like any human when they are in this environment, because their healing ability would be used to counter the radiation damage. But now imagine we take a member of this population and place him in an environment where there is close to 0 radiation, then could his regenerative body heal faster than one of a "normal" human?
Could it be possible for a human to develop healing ability through evolution in a radioactive environment? If yes, would it help him in a non-radioactive environment?
For each of your answers could you explain why it would be plausible or why it is nonsense, thank you! Oh and sorry if there are any mistakes, English is not my native language :)