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Radiation has a variety of different meanings.

Look up radiation in Wiktionary, the free dictionary.


  • Cherenkov radiation — Emission of radiation by a particle moving through an insulating medium faster than the speed of light in that medium.
  • Electromagnetic radiation — Stream of photons of a variety of different energies. At low frequencies, such as radio, it is common to regard the radiation as continuous rather than as photons.
  • Ionizing radiation — Stream of particles (photons or other particles) with sufficient energy to cause ionization of atoms or molecules.
  • Gravitational radiation — A predicted consequence of general relativity, however, it has not been directly observed.
  • Non-ionizing radiation — Any type of electromagnetic radiation that does not carry enough energy to ionize living material.
  • Particle radiation — Any kind of radiation in which the individual elements behave like particles.
  • Synchrotron radiation — Emission of radiation by a charged particle undergoing acceleration.
  • Thermal radiation — Process by which a hot object emits electromagnetic radiation; it is one of the three methods of heat flow.
  • Radiant energy is radiation emitted by a source into the surrounding environment.


  • Adaptive radiation — a process in evolutionary biology by which one species becomes many in order to adapt to specific ecological niches.


  • eta radiation refers to insolation in the ETA meteorological model


  • Theta radiation and Omicron radiation are found in Star Trek

See also

  • Radioactive contamination — Release of radioactive material into the environment.
  • Radioactive decay — Set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles (radiation).

ca:Radiació de:Strahlung es:Radiación eo:Radiado fr:Radiation ko:방사선 he:קרינה nl:Straling ja:放射線 pt:Radiação simple:Radiation fi:Säteily sv:Strålning no:Radioaktivitet