Radiation can refer to one of the following:

Look up radiation in Wiktionary, the free dictionary.

Specific types in physics: Wikipedia does not have an article with this exact name. ... Wiktionary logo Wiktionary is a sister project to Wikipedia intended to be a free wiki dictionary (including thesaurus and lexicon) in every language. ...

• Alpha radiation, composed of the nuclei of helium-4 atoms.
• Beta radiation, consisting of energetic electrons or positrons.
• Gamma radiation, which are high-energy electromagnetic waves such as X rays.
• Delta radiation
• Epsilon radiation
• Cherenkov radiation, radiation by a particle moving through an insulating medium faster than the speed of light in that medium.
• Electromagnetic radiation, a stream of photons.
• Gravitational radiation, a predicted consequence of general relativity.
• Neutron radiation
• Synchrotron radiation, the emission of radiation by a charged particle undergoing acceleration.
• Thermal radiation, the process by which a hot object emits electromagnetic radiation.
• Solar radiation, radiation emitted by the sun.
• Hawking radiation, thermal radiation thought to be emitted by black holes due to quantum effects.

General types in physics: An alpha particle is deflected by a magnetic field Alpha particles or alpha rays are a form of particle radiation which are highly ionizing and have low penetration. ... Beta particles are high-energy electrons emitted by certain types of radioactive nuclei such as potassium-40. ... This article is about electromagnetic radiation. ... It has been suggested that this article or section be merged with delta ray. ... Epsilon Radiation is tertiary radiation caused by secondary radiation. ... Cherenkov radiation glowing in the core of a TRIGA reactor Cherenkov radiation (also spelled Cerenkov or sometimes Čerenkov) is electromagnetic radiation emitted when a charged particle passes through an insulator at a speed greater than that of light in the medium. ... Electromagnetic radiation can be conceptualized as a self propagating transverse oscillating wave of electric and magnetic fields. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Neutron radiation consists of free neutrons. ... Hannes Alfvén, and Nicolai Herlofson, predicted synchrotron radiation in space in 1950 [1] Synchrotron radiation is electromagnetic radiation, similar to cyclotron radiation, but generated by the acceleration of ultrarelativistic (i. ... Thermal radiation, or radiant heat, is electromagnetic radiation from an object that is simply caused by its temperature. ... Solar irradiance spectrum at top of atmosphere. ... In physics, Hawking radiation is thermal radiation thought to be emitted by black holes due to quantum effects. ...

• Ionizing radiation, a stream of particles with sufficient energy to cause ionization.
• Non-ionizing radiation, electromagnetic radiation that does not carry enough energy to ionize living material.
• Particle radiation, radiation by means of particles that have a rest mass.
• Radiant energy, radiation emitted by a source into the surrounding environment.

In evolutionary biology Ionizing radiation is a type of particle radiation in which an individual particle (for example, a photon, electron, or helium nucleus) carries enough energy to ionize an atom or molecule (that is, to completely remove an electron from its orbit). ... Non-ionising radiation (or in American English non-ionizing radiation) refers to any type of electromagnetic radiation that does not carry enough energy to ionize living material - that is, to completely remove an electron from an atom or molecule. ... Particle radiation is the radiation of energy by means of small fast-moving particles that have energy and mass. ... Radiant energy is the energy transported by electromagnetic waves. ...

• adaptive radiation, the rapid speciation of a single or a few species to fill many ecological niches

In fiction: Adaptive radiation describes the rapid speciation of a single or a few species to fill many ecological niches. ...

• Theta radiation and Omicron radiation, which are found in Star Trek

Star Trek collectively refers to a science-fiction franchise spanning six unique television series, 726 episodes and ten motion pictures in addition to hundreds of novels, video games, and other works of fiction all set within the same fictional universe created by Gene Roddenberry in the mid-1960s. ...

See also

• Radioactive decay
• Radioactive contamination