[Tijeras_Slim]

1) Shine a flashlight at something. That is like radiation. When you turn the flashlight off, whatever you shined it on has not become radioactive. Nor is it contaminated.

True with gammas, but neutrons can activate material.

[yefragetuwrabrumuy]

Yes, high speed neutrons causing enhanced radiation in metal are an exception. However, they are not a factor in this situation.