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1895-11-08 to Present

United Kingdom, U.S., Germany, France, Worldwide

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X-ray

X-ray, or X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometres to 10 nanometres, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1015 Hz to 3×1018 Hz) and energies in the range 124 eV to 124 keV.
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