Radiation is a process in which a body emits energy that propagates through a medium or through empty space, but is absorbed by other bodies. Radiation may also refer to:

Look up radiation in Wiktionary, the free dictionary.

• Electromagnetic radiation, radiation that takes the form of a self-propagating wave of electric and magnetic fields,
  • Particular wavelength bands of full electromagnetic spectrum, such as gamma rays, radio waves, visible light
  • Thermal radiation, electromagnetic radiation that emanates from every object above absolute zero in proportion to the fourth power of its temperature
  • Synchrotron radiation (also called a synchrotron light source), electromagnetic radiation generated by the acceleration of fast moving charged particles through magnetic fields
• Gravitational radiation, radiation that takes the form of gravitational waves, or ripples in the curvature of spacetime.
• Ionizing radiation, radiation that is of high enough energy to cause atoms to lose or gain electrons, rendering molecules, such as proteins, incapable of functioning
• Nuclear radiation, radiation, especially ionizing radiation, that emanates from nuclear processes such as radioactive decay
• Acoustic radiation, which takes the form of mechanical waves in a physical transmission medium, such as ultrasound, sound, and seismic waves

• Radiation therapy, also called radiotherapy, a medical treatment that involves exposing part or all of the body to a controlled amount of ionizing radiation
• Optic or acoustic radiations, signal pathway structures of human brain white matter in the visual and auditory systems

• Evolutionary radiation, a diversification into several lineages from a common ancestor
• Adaptive radiation, an evolutionary radiation to fill many ecological niches

• Radiation (album), released in 1998, the tenth studio album by the British progressive rock band Marillion
• Roddy Radiation, stage name of Roddy Byers (born 1955), English musician
• A pseudonym of Toby Fox, composer for the webcomic Homestuck, and creator of the video game Undertale
• "Radiation", a 1997 song by Feeder, from the album Polythene
• "Radiation", a 2011 song by Gavin DeGraw, from the album Sweeter

• Radiation, Inc., now Harris Corporation

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