Superman/Hulk radiation

Who can withstand the most radiation before dying, if either of them dies at all?
Talking "RL" A bomb, H bomb nuclear type radiation.

They can both absorb it at some point, so I don't think it's actually possible to kill either of these with radiation.

Superman could adjust and eventually live off of it/grow stronger.

Hulk's gotta be immune to the stuff by now.

So, even Stevens.