Answer:
Shining visible radiation from a torch beam onto a hand lights the hand up because the hand has been exposed to light.
Exposing objects to beams of radiation is called irradiation. The term applies to all types of radiation, including radiation from the nuclei of atoms.
Irradiation from radioactive decay can damage living cells. This can be put to good use as well as being a hazard.
Contamination occurs if an object has a radioactive material introduced into it. An apple exposed to the radiation from cobalt-60 is irradiated, but an apple with cobalt-60 injected into it is contaminated.
As with irradiation, contamination can be very useful as well as being potentially harmful.
Hope this helps !