gy radiation definition
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gray Noun. 1. Gy-the SI unit of energy absorbed from ionizing radiation; equal to the absorption of one joule of radiation energy by one kilogram of matter; one gray equals 100 rad. gray. radioactivity unit-a measure of radioactivity.
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radiation Definition of radiation for English Language Learners. : a type of dangerous and powerful energy that is produced by radioactive substances and nuclear reactions. medical : the use of controlled amounts of radiation for the treatment of diseases (such as cancer)
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Gamma ray However, this is not a strict definition, but rather only a rule-of-thumb description for natural processes. Electromagnetic radiation from radioactive decay of atomic nuclei is referred to as gamma rays no matter its energy, so that there is no lower limit to gamma energy derived from radioactive decay. This radiation commonly has energy of a few hundred keV, and almost always less than 10 MeV.
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What is centigray (unit) Centigray is a radiation absorbed dose measurement unit. A centigray (cGy) is a derived metric (SI) measurement unit of absorbed radiation dose of ionizing radiation, e.g. X-rays. The SI prefix centi stands for one hunfredths.
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Radiation Quantities and Units Absorbed dose is measured in joules/kilogram, and a quantity of 1 joule/kilogram has the special unit of gray (Gy) in the International System of quantities and units. (In terms of the older system of radiation quantities and units previously used, 1 Gy equals 100 rad, or 1mGy equals 0.1 rad.)
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Radiation and Albedo Experiment Radiation is the transfer of heat energy by electromagnetic wave motion. The transfer of energy from the sun across nearly empty space is accomplished primarily by radiation. Radiation occurs without the involvement of a physical substance as the medium.
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- a greenhouse gas sometimes abbreviated ghg is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range this process is the fundamental cause of the greenhouse effect greenhouse gas sometimes abbreviated ghg is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range this process is the fundamental cause of the greenhouse effect
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- Gamma ray (also called gamma radiation), denoted by the lower-case Greek letter gamma (γ or γ {\displaystyle \gamma } ), is penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei and consists of high-energy photons.
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What is a Greenhouse Gas? What is a Greenhouse Gas? A greenhouse gas (often abbreviated as GHG) is a gas that both absorbs and emits radiation in the infrared range, commonly called thermal radiation or heat. When present in the atmosphere, these gases trap radiation in the form of heat, causing a warming process called the greenhouse effect.
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centigray (cGy) [sen´tĭ-gra″] a unit of absorbed radiation dose equal to one hundredth (10−2) of a gray, or 1 rad. /cen·ti·gray/ (cGy) (-gra″) a unit of absorbed radiation dose equal to one hundredth (10−2) of a gray, or 1 rad. centigray (cGy) a unit of absorbed radiation dose equal to one hundredth (10-2) of a gray, or 1 rad.
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gamma ray noun, Physics. 1. a photon of penetrating electromagnetic radiation (gamma radiation) emitted from an atomic nucleus. 2. a photon emitted by an electron as a result of internal conversion. 3. electromagnetic radiation with wavelengths shorter than approximately one tenth of a nanometer.
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radiation A sign warns of radiation. noun. Radiation is the process of sending off energy in the form of light, heat, x-rays or nuclear particles. An example of radiation are the energy waves off of a nuclear bomb. An example of radiation is the energy in the atmosphere monitored by radiation detectors such as the Xetex brand of personal radiation detector which were ultimately discontinued in the 1990s.
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Gamma Rays The gamma rays are just like other electromagnetic rays which are emitted by different sources under different circumstances. These are emitted by the hottest part of our universe and also these are emitted by the radioactive decay of certain material, like cobalt-60, zinc-65, cesium-137, and radium-226.
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- Medical Definition of GAMMA RAY. : a photon emitted spontaneously by a radioactive substance; also: a high-energy photon—usually used in plural.edical Definition of GAMMA RAY. : a photon emitted spontaneously by a radioactive substance; also: a high-energy photon—usually used in plural.
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Measuring Radiation 1 For radiation absorbed by a person: the conventional unit is rad and the SI unit gray (Gy).  For biological risk of exposure to radiation: the conventional unit is rem and the SI unit sievert (Sv). (Source: http://www.bt.cdc.gov/radiation/measurement.asp)
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- 1 For the amount of radiation being given off by a radioactive material: the conventional unit is curie (Ci) and the SI unit becquerel (Bq).  For radiation absorbed by a person: the conventional unit is rad and the SI unit gray (Gy).
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Absorbed dose Absorbed dose is a measure of the energy deposited in a medium by ionizing radiation.It is equal to the energy deposited per unit mass of medium, and so has the unit J/kg or gray (Gy) where 1Gy = 1Jkg -1. The absorbed dose is not a good indicator of the likely biological effect.1 Gy of alpha radiation would be much more biologically damaging than 1 Gy of photon radiation for example.Appropriate weighting factors can be applied reflecting the different relative biological effects to find the equivalent dose.bsorbed dose is a measure of the energy deposited in a medium by ionizing radiation.
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gamma rays gamma rays, n an electromagnetic radiation of short wavelength emitted by the nucleus of an atom during a nuclear reaction. Composed of high-energy photons, gamma rays lack mass and an electric charge and travel at the speed of light.
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Gamma decay Gamma decay, type of radioactivity in which some unstable atomic nuclei dissipate excess energy by a spontaneous electromagnetic process. In the most common form of gamma decay, known as gamma emission, gamma rays (photons, or packets of electromagnetic energy, of extremely short wavelength) are radiated. Gamma decay also includes two other electromagnetic processes, internal conversion and internal pair production.
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What Are Gamma-Rays? Gamma-rays are a form of electromagnetic radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves. Gamma-rays can be used to treat cancer, and gamma-ray bursts are studied by astronomers.
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radiation Three types of units are used to measure ionizing radiation. The roentgen (R) is a unit of exposure dose applicable only to x-rays and gamma rays. It is the amount of radiation that produces 2.58 × 10 −4 coulomb of positive and negative ions passing through 1 kilogram of dry air. (stray radiation), the escape of radiation through the protective shielding of the radiography unit tube head. This radiation is detected at the sides, top, bottom, or back of the tube head; it does not include the useful beam.
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cosmic background radiation cosmic background radiation. noun, Astronomy. 1. electromagnetic radiation coming from every direction in the universe, considered the remnant of the big bang and corresponding to the black-body radiation of 3 K, the temperature to which the universe has cooled.
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- Also found in: Dictionary, Acronyms, Wikipedia. centigray. a unit of absorbed radiation dose equal to one hundredth (10−2) of a gray, or 1 rad. centigray. /cen·ti·gray/ (cGy) (-gra″) a unit of absorbed radiation dose equal to one hundredth (10−2) of a gray, or 1 rad. [sen′tigra] a unit of absorbed radiation dose equal to one hundredth (10-2) of a gray, or 1 rad.
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7.3 Chem Definition of ELECTROMAGNETIC RADIATION. : energy in the form of electromagnetic waves; also: a series of electromagnetic waves.
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Gamma ray Gamma-ray photons, like their X-ray counterparts, are a form of ionizing radiation; when they pass through matter, they usually deposit their energy by liberating electrons from atoms and molecules. At the lower energy ranges, a gamma-ray photon is often completely absorbed by an atom and the gamma ray’s energy transferred to a single ejected electron (see photoelectric effect). Higher-energy gamma rays are more likely to scatter from the atomic electrons, depositing a fraction of their energy in each scattering event (see Compton effect).
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Dictionary of Radiation Terms Gamma Radiation Definition: High energy photons that are emitted by radioactive nuclei. Gamma radiation is very high-energy ionizing radiation. Gamma rays originate in the nucleus, while X-rays originate in the electron cloud around the nucleus. Up Next. Up Next.