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Что (кто) такое background radiation - определение
Background radiation
![gamma radiation]] level is 9.8 [[μR/h]] (0.82 mSv/a) This is very close to the world average background radiation of 0.87 mSv/a from cosmic and terrestrial sources.](https://commons.wikimedia.org/wiki/Special:FilePath/Atomic Testing Museum weather display cropped.jpg?width=200 "gamma radiation]] level is 9.8 [[μR/h]] (0.82 mSv/a) This is very close to the world average background radiation of 0.87 mSv/a from cosmic and terrestrial sources.")
LEVEL OF IONIZING RADIATION PRESENT IN THE NATURAL ENVIRONMENT
Background Radiation; Natural radioactivity; Terrestrial radiation; Natural radiation; Background count; Natural background radiation; Environmental radiation; Radiation background; Ambient radiation
Background radiation is a measure of the level of ionizing radiation present in the environment at a particular location which is not due to deliberate introduction of radiation sources.
Background radiation equivalent time
Background radiation equivalent time (BRET) or background equivalent radiation time (BERT) is a unit of measurement of ionizing radiation dosage amounting to one day worth of average human exposure to background radiation.
Cosmic microwave background
![error bars]] are too small to be seen even in an enlarged image, and it is impossible to distinguish the observed data from the theoretical curve.](https://commons.wikimedia.org/wiki/Special:FilePath/Cmbr.svg?width=200 "error bars]] are too small to be seen even in an enlarged image, and it is impossible to distinguish the observed data from the theoretical curve.")
![The [[Holmdel Horn Antenna]] on which Penzias and Wilson discovered the cosmic microwave background. The antenna was constructed in 1959 to support [[Project Echo]]—the National Aeronautics and Space Administration's passive communications satellites, which used large earth orbiting aluminized plastic balloons as reflectors to bounce radio signals from one point on the Earth to another.](https://commons.wikimedia.org/wiki/Special:FilePath/Horn Antenna-in Holmdel, New Jersey - restoration1.jpg?width=200 "The [[Holmdel Horn Antenna]] on which Penzias and Wilson discovered the cosmic microwave background. The antenna was constructed in 1959 to support [[Project Echo]]—the National Aeronautics and Space Administration's passive communications satellites, which used large earth orbiting aluminized plastic balloons as reflectors to bounce radio signals from one point on the Earth to another.")
![Planck]]<br />(March 21, 2013)](https://commons.wikimedia.org/wiki/Special:FilePath/PIA16874-CobeWmapPlanckComparison-20130321.jpg?width=200 "Planck]]<br />(March 21, 2013)")
![VSA]] (2004) instruments. Also shown is a theoretical model (solid line).](https://commons.wikimedia.org/wiki/Special:FilePath/PowerSpectrumExt.svg?width=200 "VSA]] (2004) instruments. Also shown is a theoretical model (solid line).")
ELECTROMAGNETIC RADIATION AS A REMNANT FROM AN EARLY STAGE OF THE UNIVERSE IN BIG BANG COSMOLOGY
Timeline of cosmic microwave background astronomy; Cosmic Microwave Background; Microwave background radiation; Last scattering; 3K radiation; CMB Radiation; Cmbe; Cmbr; Atacama Pathfinder EXperiment /SZ; Noise (Big-bang); Microwave background; Cosmic microwave radiation; CMB; CMBR; Relic radiation; Cosmic Microwave Background Radiation; CMB radiation; C M B; C. M. B.; Surface of last scattering; Last scattering surface; CMB frame; Cosmic power spectrum; Cosmic microwave background radiation; Cosmic microwave background polarization; Primordial B-mode; Primordial gravitational wave; B modes; B-modes; Cosmic Background Microwave Radiation
In Big Bang cosmology the cosmic microwave background (CMB, CMBR) is electromagnetic radiation that is a remnant from an early stage of the universe, also known as "relic radiation". The CMB is faint cosmic background radiation filling all space.
Примеры употребления для background radiation
1. For the general public, it‘s about what you get from background radiation – 3 mSv per year.
2. Average background radiation over a year nationwide is about 350 milirems a year.
3. The background radiation we can measure today corresponds to a temperature that is barely 2.7 degrees above absolute zero."
4. Rees, for his work studying cosmic microwave background radiation and how galaxies form; and Canadian Arthur B.
5. These were imprinted in the cosmic microwave background radiation, the embers of the Big Bang, when the universe was only 400,000 years old.