X-ray
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An X-ray is a form of high-energy electromagnetic radiation with a wavelength shorter than those of ultraviolet rays and longer than those of gamma rays. Roughly, X-rays have a wavelength ranging from
Natural color X-ray photogram of a wine scene. Note the edges of hollow cylinders as compared to the solid candle.
Example of a Crookes tube, a type of discharge tube that emitted X-rays
Wilhelm Röntgen
Hand mit Ringen (Hand with Ring): print of Wilhelm Röntgen's first "medical" X-ray, of his wife's hand, taken on 22 December 1895 and presented to Ludwig Zehnder of the Physik Institut, University of Freiburg, on 1 January 1896
Radiation
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In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or a material medium. This includes:
Some kinds of ionizing radiation can be detected in a cloud chamber.