Board Thread:Off Topic/@comment-26397825-20160113034906/@comment-24891101-20160121043843

The only reasons gamma is associated with green is because of general radioactivity (ignoring that they're completely different forms, and it's only really radium which is green) and secondarily because Marvel made the association via "gamma green" and The Hulk, no doubt building off the first.

It's really tenuous.