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X-rays (or Röntgen radiation) (TV: Smith and Jones) were a type of electromagnetic radiation. They were used in medical examinations because they penetrated soft tissue, allowing a non-invasive exam of the internal anatomy; they could also be used to examine the interiors of sealed objects using the same method. High levels of X-ray radiation could be harmful to many forms of life. When focused into a coherent beam or laser, X-rays could be used as an offensive weapon.
Instances of medical X-ray use Edit
On Wengrol, Yend biologists saw on their X-ray screens that the First Doctor (whom they had mistaken for a shapeshifter) didn't change shape, giving them hope that they might have found a cure for their mutation. (PROSE: The Sons of the Crab)
Instances of X-rays as non-medical imaging Edit
The Mantis leader, in his attempts to learn the nature of the Doctor's TARDIS, had it subjected to X-rays, to find it was dimensionally transcendental and that the Third Doctor was inside it. (COMIC: Size Control)