X-rays

X-rays (or Röntgen rays) are a form of electromagnetic radiation with a wavelength in the range of 10 to 0.01 nanometers, corresponding to frequencies in the range 30 PHz to 30 EHz. X-rays are primarily used for diagnostic radiography and crystallography. X-rays are a form of ionizing radiation and as such can be dangerous. In many languages it is called Röntgen radiation after one of the first investigators of the X-rays, Wilhelm Conrad Röntgen.
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Verb
1. examine by taking x-rays
(hypernym) examine, see
(derivation) X-raying, X-radiation
2. take an x-ray of something or somebody; "The doctor x-rayed my chest"
(hypernym) photograph, snap, shoot
(derivation) X-raying, X-radiation
(classification) photography, picture taking

High energy electromagnetic radiation of wavelengths in the range 10 to 0.1 nanometres. The only photons which are usually more energetic are gamma rays (which originate in the nucleus of atoms). X-rays are extra-nuclear and have two sources: (1). A characteristic (e.g.K- or L-) X-ray photon is created and emitted when an electron drops down orbits to fill a vacancy in an innermost shell. The wavelength of the photon is unique to the atom and affords an unambigious method of identifying the element by use of an X-ray spectrometer . (2). A bremsstrahlung photon is produced when a high speed positive or negative electron decelerates when passing through the electric field in the close vicinity of an atomic nucleus. The spectrum in this case is continuous up to the maximum energy of the bombarding electrons.

Penetrating electromagnetic radiation (photon) having a wavelength that is much shorter than that of visible light. These rays are usually produced by excitation of the electron field around certain nuclei. In nuclear reactions, it is customary to refer to photons originating in the nucleus as x-rays.

x-rays
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