William Roentgen, who discovered x rays in
1895. Around this time, various scientists were investigating the movement of
electrons through a glass apparatus known as a Crookes tube. Roentgen wanted to
visually capture the action of the electrons, so he wrapped his Crookes tube in
black photographic paper. When he ran his experiment, he noticed that a plate
coated with a fluorescent material, which just happened to be lying nearby the
tube, fluoresced or glowed. This was unexpected because no visible light was
being emitted from the wrapped tube. Upon further investigation, he found that
indeed there was some kind of invisible light produced by this tungsten alloy tube, and it
could penetrate materials such as wood, aluminum, or human skin.
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