Both of your posts contain very little self-doubt and curiosity. Many points don't seem convincing, and you're consistently not steelmanning the arguments you are replying to.

> it's a machine which is slightly radioactive because it was in the presence of a radiation source

This isn't how radiation works. Material doesn't get radioactive from being in the presence of a radioactive source. Contamination refers to radioactive emitters being somewhere they don't belong.