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ray X

X ray, type of radiation of higher frequency than visible light but lower than a gamma ray. Discovered by the German physicist Wilhem Conrad Roentgen in 1895, X rays are usually produced by high-energy electrons impinging upon a metal target. X rays are often used in medicine to make radiographs (X-ray pictures) of the bones and internal organs of the body.

See also: Roentgen, Wilhelm Conrad.

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