K-M, it looks ambiguous, but that's not what Phil was saying. He's saying that it's because Walt's immune and and was exposed that he'd give off rads. (Not rats in human form; I believe that's Carrion, and he lives in New York.)
My question is not so much 'is there a connection between Walt / Sas and gamma radiation?' as 'do they say or imply that Sasquatch was created by gamma radiation, and is one of the gamma creatures like Hulk, Doc Sampson, The Leader, or the Abomination?' 'Did he then turn orange because Byrne was such a genius that he foresaw the time when green would no longer exist in comics, and orange was the only colour in the medium?'
- Le Messor
"There is only one thing in the world worse than being talked about, and that is not being talked about."
~ Oscar Wilde