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X-rays and gamma rays

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  • Gamma ray — Gamma rays (denoted as gamma;) are a form of electromagnetic radiation or light emission of frequencies produced by sub atomic particle interactions, such as electron positron annihilation or radioactive decay. Gamma rays are generally… …   Wikipedia

  • Gamma knife — Gamma Knife® (or Leksell Gamma Knife®) is a device used to treat brain tumors with a high dose of radiation therapy in one day. The device was invented by Lars Leksell, a Swedish neurosurgeon, in 1967 at the Karolinska Institute in Sweden. Gamma… …   Wikipedia

  • Gamma ray spectrometer — A Gamma Ray Spectrometer, or (GRS), is an instrument for measuring the distribution (or spectrum see figure) of the intensity of gamma radiation versus the energy of each photon. Gamma rays are electromagnetic radiation at the short wavelength,… …   Wikipedia

  • gamma ray — 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… …   Universalium

  • gamma-ray astronomy — /gam euh ray / the branch of astronomy that deals with the study of celestial objects by means of the gamma rays that come from them. [1960 1965] * * * Study of astronomical objects and phenomena that emit gamma rays. Gamma ray telescopes are… …   Universalium

  • Gamma ray burst — [ GRB 990123 taken on January 23, 1999. The burst is seen as a bright dot denoted by a square on the left, with an enlarged cutout on the right. The object above it with the finger like filaments is the originating galaxy. This galaxy seems to be …   Wikipedia

  • Gamma Ray Burst Coordinates Network — The Gamma Ray Burst Coordinates Network (GCN) is a system that distributes information about the location of a Gamma ray burst (GRB), called Notices , when a burst is detected by various spacecraft. The GCN also automatically receives and… …   Wikipedia

  • Gamma-ray astronomy — is the astronomical study of the cosmos with gamma rays. Early history Long before experiments could detect gamma rays emitted by cosmic sources, scientists had known that the universe should be producing these photons. Work by Eugene Feenberg… …   Wikipedia

  • gamma rays — gamma radiation or gamma rays noun A penetrating radiation given off by radium and other radioactive substances • • • Main Entry: ↑gamma * * * noun [plural] : powerful invisible rays that are sent out from some radioactive substances called also… …   Useful english dictionary

  • Gamma ray logging — is a method of measuring naturally occuring gamma radiation to characterize the rock or sediment in a borehole. It is sometimes used in mineral exploration and water well drilling, but most commonly for formation evaluation in oil and gas well… …   Wikipedia

  • Gamma ray burst progenitors — are the types of celestial objects that can emit gamma ray bursts (GRBs). GRBs show an extraordinary degree of diversity. They can last anywhere from a fraction of a second to many minutes. Bursts could have a single profile or oscillate wildly… …   Wikipedia

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