BCV's are dead -- they'll wind up as radioactive dead, but essentially unimpaired (easier to detect, though, with the right gear!)
Radiation penetrates matter -- I wouldn't allow "Toughness" to apply to charged subatomic particles zipping through the body... Recovery-powers should apply, and (except for massive doses) their healing-rates vs the relatively-slow onset of symptoms from radiation, make both RCV's and WCV's "seem to be" immune to radiation. Presumably they'd need to feed fairly urgently, as their Recovery powers dip into their Hunger Tracks.