X-Ray

X-radiation (composed of X-rays) is a form of electromagnetic radiation. Most X-rays have a wavelengthranging from 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz(3×1016 Hz to 3×1019 Hz) and energies in the range 100 eV to 100 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. In many languages, X-radiation is referred to with terms meaning Röntgen radiation, after Wilhelm Röntgen,who is usually credited as its discoverer, and who had named it X-radiation to signify an unknown type of radiation.