Is a Radon Problem Ever Not Correctable?

[Ron Healy]

I have an opportunity to buy a SFR foreclosure that may have a Radon problem. I've been told by a friend that's the reason the previous owners walked away from the house and the mortgage.

Question - Is there ever a time when Radon is not correctable?  I'm familiar with the normal fixes, etc., but is there a chance that nothing I do will work?

Thanks!