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- X-ray
Electromagnetic radiation of wavelength ranging from 10 pm to 10 nm
X-rays (or much less commonly, X-radiation) are a form of high-energy electromagnetic radiation. In many languages, it is referred to as Röntgen radiation, after the German scientist Wilhelm Conrad Röntgen, who discovered it in 1895 and named it X-radiation to signify an unknown type of radiation. X-ray wavelengths are shorter than those of ultraviolet rays and longer than those of gamma rays. The... Wikipedia
