Also there's uranium glass tableware that is luminous under UV-rays, and it produces exact that lime/salad color we can see in game when placed under UV lamp. It's not dangerous it doesn't emit ionizing radiation since depleted uranium is used for it.
Almost in 100% comic radiation or radioactivity is associated with yellow-green color, and radioactive waste is given that color too, to the point that giving actual Cherenkov radiation color would be an offset.
It's almost same as in Pokémon franchaise, all electric abilities Pokémon have yellowish-goldish color, think that of the Pikachu, despite that Tesla coils produce bolts in air those are lit in violet-ish color, much like We have in City of Heroes as default electric power color (except for Mu powers).