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Encyclopedia > Radiation length

Radiation Length , High-energy electrons predominantly lose energy in matter by bremsstrahlung, and high-energy photons by e + e pair production. The characteristic amount of matter traversed for these related interactions is called the radiation length X0, usually measured in gcm − 2. It is both the mean distance over which a high-energy electron loses all but 1/e of its energy by bremsstrahlung, and 7/9 of the mean free path for pair production by a high-energy photon. It is also the appropriate scale length for describing high-energy electromagnetic cascades. Properties The electron (also called negatron, commonly represented as e−) is a subatomic particle. ... (help· info), (from the German bremsen, to brake and Strahlung, radiation, thus, braking radiation), is electromagnetic radiation produced by the acceleration of a charged particle, such as an electron, when deflected by another charged particle, such as an atomic nucleus. ... In physics, the photon (from Greek φως, phōs, meaning light) is the quantum of the electromagnetic field; for instance, light. ...

See also

In physics, the attenuation length is the distance into a material when the probability has dropped to that a particle has not been absorbed. ... Attenuation is the decrease in intensity of electromagnetic radiation due to absorption or scattering of photons. ...


S. Eidelman et al. Particle Data Group, Review of particle physics, Phys. Lett. B 592 (2004) (http://pdg.lbl.gov/) The Particle Data Group is an international collaboration of particle physicists that compiles and reanalyzes published results related to the properties of particles and fundamental interactions. ...

  Results from FactBites:
Radiation Injuries: Encyclopedia of Nursing & Allied Health (1342 words)
Radiation is emitted by atoms in the process of changing, whether the atomic action is a naturally occurring or humanly directed process.
Radiation damage depends upon the amount of radiation, the time over which it is absorbed, and the susceptibility of the tissue.
X ray technologists can help prevent radiation exposure to themselves and to their patients by making sure equipment is proper working order and that appropriate preventative measures, such as the use of shields and radiation badges, are taken.
Laser gyroscope - Patent 4013365 (4302 words)
Radiant energy emitted by the gain medium becomes the laser radiation in the laser cavity with the frequency of the laser radiation being established by the length of the cavity, as discussed hereinbefore.
The laser radiation is split before entering the ring interferometer and it is in the ring interferometer that an interference pattern is established between the clockwise and counterclockwise laser radiation.
The emerging laser radiation is combined and serves as the input to a conventional detector capable of detecting fringe shift that has occurred as a result of angular rotation of the plane of the ring interferometer.
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