Yes Metals in general shild RF-Waves used to sample the image (and could get hot by that process)

I think its not about the property of beeing a metall ist a bout beeing ferromagnetic (In that case probably not an issue because these bearing balls are usually out of some kind stainless steel. )

Wow: Balls of Steel AND Darwin Award at the same time…

Yes the gamma rays even disinfect your wohle immune system… actually you are dead within 1min close the the handrails…