Natural color<unk>  photogram of a wine scene An<unk> , or, much less commonly,<unk> iation, is a penetrating form of high-energy electromagnetic radiation. Most<unk> s have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz ( to ) and energies in the range 145eV to 124 keV.<unk>  wavelengths are shorter than those of UV<unk> s and typically longer than those of gamma<unk> s. In many languages,<unk> iation is referred to as Röntgen radiation, after the German scientist Wilhelm Conrad Röntgen, who discovered it on November 8, 1895. He named it<unk> iation to signify an unknown type of radiation. Spellings of<unk> (s) in English include the variants<unk> (s),<unk> (s), and<unk> (s).
X-ray
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Medicine chest 
Medicine chest
Radiography
Radiochemistry
Hip examination
Radiology