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- Radiation | Definition, Types, Effects, Facts | Britannica
Radiation, flow of atomic and subatomic particles and of waves, such as those that characterize heat rays, light rays, and X rays All matter is constantly bombarded with radiation of both types from cosmic and terrestrial sources This article delineates the properties and behaviour of radiation
- Radiation - Particles, Waves, Energy | Britannica
Radiation - Particles, Waves, Energy: Matter in bulk comprises particles that, compared to radiation, may be said to be at rest, but the motion of the molecules that compose matter, which is attributable to its temperature, is equivalent to travel at the rate of hundreds of metres per second Although matter is commonly considered to exist in three forms, solid, liquid, and gas, a review of
- Ionizing radiation | Definition, Sources, Types, Effects, Facts . . .
Ionizing radiation, flow of energy in the form of atomic and subatomic particles or electromagnetic waves that is capable of freeing electrons from an atom, causing the atom to become charged (or ionized) Ionizing radiation includes the more energetic end of the electromagnetic spectrum and subatomic particles
- Electromagnetic radiation | Spectrum, Examples, Types | Britannica
Electromagnetic radiation, in classical physics, the flow of energy at the speed of light through free space or through a material medium in the form of the electric and magnetic fields that make up electromagnetic waves such as radio waves and visible light
- Electromagnetic and acoustic radiation | Britannica
radiation, Process by which energy is emitted from a source and propagated through the surrounding medium, or the energy involved in this process Radiation consists of a flow of atomic or subatomic particles or of waves
- Radiation - Imaging, Therapy, Detection | Britannica
Radiation - Imaging, Therapy, Detection: The uses of radiation in diagnosis and treatment have multiplied so rapidly in recent years that one or another form of radiation is now indispensable in virtually every branch of medicine The many forms of radiation that are used include electromagnetic waves of widely differing wavelengths (e g , radio waves, visible light, ultraviolet radiation, X
- Radiation - Absorption, Ionization, Chemistry | Britannica
Radiation - Absorption, Ionization, Chemistry: When a target is bombarded by a positive ion such as the hydrogen ion H+ or the deuterium ion D+ from a particle accelerator or the alpha particle 4He2+ from nuclear decay, or indeed any high-energy heavy positive ion, the initial effects differ significantly from those of a high-energy electron This situation results from the fact that, for the
- Radiation - Waves, Particles, History | Britannica
Radiation - Waves, Particles, History: Within weeks after Röntgen revealed the first X-ray photographs in January 1896, news of the discovery spread throughout the world Soon afterward, the penetrating properties of the rays began to be exploited for medical purposes, with no inkling that such radiation might have deleterious effects The first reports of X-ray injury to human tissue came
- Radiation - Interaction, Matter, Processes | Britannica
Radiation - Interaction, Matter, Processes: A discussion of this subject requires preliminary definition of a few of the more common terms Around every particle, whether it be at rest or in motion, whether it be charged or uncharged, there are potential fields of various kinds As one example, a gravitational field exists around the Earth and indeed around every particle of mass that moves
- Radiation - Health Effects, Exposure, Protection | Britannica
Radiation - Health Effects, Exposure, Protection: The signs and symptoms resulting from intensive irradiation of a large portion of the bone marrow or gastrointestinal tract constitute a clinical picture known as radiation sickness, or the acute radiation syndrome Early manifestations of this condition typically include loss of appetite, nausea, and vomiting within the first few hours after
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