the world > matter > physics > atomic nucleus > radioactivity > X-rays > [adjective] > exposed to action of X-rays (3)
Subjected or exposed to X-rays; spec. (of a gas) ionized by the passage of X-rays. Also: examined or treated by means of X-rays.
Exposed to the action of some kind of radiation (see irradiate, v. 1d).
Treated with or examined by means of X-rays or other radiation; irradiated. Now rare.