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Radiation has a variety of different meanings.
- 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
- 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).