radiation
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- (RAY-dee-AY-shun) Energy released in the form of particle or electromagnetic waves. Common sources of radiation include radon gas, cosmic rays from outer space, medical x-rays, and energy given off by a radioisotope (unstable form of a chemical element that releases radiation as it breaks down and becomes more stable).
National Cancer Institute - Cite This Source - This Definition - linac, linear accelerator, mega-voltage linear accelerator, MeV linear accelerator
- (RA'-de-ay'-shun) energy transmitted by waves through space or through some medium' usually referring to electromagnetic radiation when used without a modifier.
DoD Breast Health Program South - Cite This Source - This Definition - diagnose, Implant radiation, medical oncologist, oncologist, pathologist, radiation oncologist, radiation therapy, radiologist, Radiotherapeutic ablation
- (ray-dee-AY-shin): The emission of energy in waves or particles. Often used to treat cancer cells.
CDC - Cite This Source - This Definition - CAT scan, chest x-ray, low-dose CAT scan, MRI, PET scan
- Energy transfer in the form of electromagnetic waves or particles that release energy when absorbed by an object. See ultraviolet radiation, infrared radiation, solar radiation, longwave radiation.
EPA - Cite This Source - This Definition - Energy emitted in the form of electromagnetic waves. Radiation has differing characteristics depending upon the wavelength. Because the radiation from the Sun is relatively energetic, it has a short wavelength (ultra-violet, visible, and near infrared) while energy radiated from the Earth's surface and the atmosphere has a longer wavelength (e.g., infrared radiation) because the Earth is cooler than the Sun. See ultraviolet radiation, infrared radiation, solar radiation, longwave radiation, terrestrial radiation.
EPA - Cite This Source - This Definition - Radiation 1) Emission or transfer of energy in the form of electromagnetic waves. 2) The process by which electromagnetic radiation is propagated through free space by virtue of joint undulatory variations in the electric and magnetic fields in space. This concept is to be distinguished from conduction and convection.
NSIDC - Cite This Source - This Definition - Absorption of radiation, Heat balance of the Earth-atmosphere system, insolation, Mount Pinatubo, Photovoltaic and solar thermal energy, Solar energy, Solar Radiation, solar variability, ultraviolet radiation, Ultraviolet Radiation (UV)
- Energy transport through electromagnetic waves. See shortwave radiation and longwave radiation.
NOAA National Weather Service - Cite This Source - This Definition - blackbody, Blackbody Radiation, dispersion, gamma ray, Graybody, Longwave Radiation, Microwave, Photosphere, Radiation Laws, Shortwave radiation, ultraviolet radiation, Visual Spectrum, X-Rays
- (1) The emission and propagation of waves transmitting energy through space or through some medium; for example, the emission and propagation of electromagnetic, sound, or elastic waves. (2) The energy transmitted by waves through space or some medium; when unqualified, usually refers to electromagnetic radiation. Also known as radiant energy. (3) A stream of particles, such as electrons, neutrons, protons, alpha particles, or high-energy photons, or a mixture of these. (See Ionizing Radiation, Nuclear Radiation, and Thermal Radiation.)
DoD Missile Defense Agency - Cite This Source - This Definition - Coherence, CRT, Electromagnetic Radiation (EMR), gamma ray, ionizing radiation, Nuclear Radiation, Radioactivity, Scattering, Thermal X-Rays, Ultraviolet (UV), X-Rays
- In communication, the emission of energy in the form of electromagnetic waves. 2. The outward flow of energy from any source in the form of radio waves. [NTIA] [RR]
ATIS - Cite This Source - This Definition - antenna, field-disturbance sensor, homing, horn, incidental-radiation device, low-power communication device, radio beam, radio equipment, reradiation