Although radiating anthrax spores has not been proven to work (I know--I work on the anthrax toxin), the energy passed through your (and my) gear is very powerful and can severely affect it. The radiation is powerful enough to break covalent bonds and pop electrons out of their orbitals and cause all sort of molecular rearrangements. Especially, since there are so many aromatic rings in gear--there are lots of possible rearrangements! Remember -- the way radiation kills living things is by rearranging DNA, which is just a bunch of aromatic molecules and some sugar. If it can do it to DNA, it can do it to your gear. I have no idea how often this occurs at the molecular level for gear, but it's probably not very common cause the gear is diluted in water or oil, so I wouldn't worry too much.