emission+of+rays

  • 1 Emission theory (vision) — Emission theory or extramission theory is the proposal that visual perception is accomplished by rays of light emitted by the eyes. This theory has been replaced by intromission theory, which is that visual perception is accomplished by rays of… …

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  • 2 Emission — may refer to: * Flue gas, also: ** Exhaust gas, flue gas occurring as a result of the combustion of a fuel * Emission of air pollutants * Emission (electromagnetic radiation), the process by which the energy of a photon is released by another… …

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  • 3 Emission spectrum — The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted by the element s atoms or the compound s molecules when they are returned to a lower energy state. Each element s …

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  • 4 Émission gamma induite — L émission gamma induite est un phénomène physique controversé consistant en l émission de rayons γ par un isomère nucléaire au cours d une transition isomérique au sein de son noyau déclenchée par une excitation extérieure, de manière comparable …

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  • 5 émission gamma en cascade — pakopinė gama spinduliuotė statusas T sritis fizika atitikmenys: angl. cascade gamma rays; successive gamma rays vok. Kaskaden Gamma Strahlen, m; Kaskaden Gamma Strahlung, f rus. каскадное гамма излучение, n; каскадные гамма лучи, m pranc.… …

    Fizikos terminų žodynas

  • 6 Particle-induced X-ray emission — or proton induced X ray emission (PIXE) is a technique used in the determining of the elemental make up of a material or sample. When a material is exposed to an ion beam, atomic interactions occur that give off EM radiation of wavelengths in the …

    Wikipedia

  • 7 Particle-Induced X-ray Emission — or Proton Induced X ray Emission (PIXE) is a technique used in the determining of the elemental make up of a material or sample. When a material is exposed to an ion beam, atomic interactions occur that give off EM radiation of wavelengths in the …

    Wikipedia

  • 8 Single photon emission computed tomography — (SPECT, or less commonly, SPET) is a nuclear medicine tomographic imaging technique using gamma rays. It is very similar to conventional nuclear medicine planar imaging using a gamma camera. However, it is able to provide true 3D information.… …

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  • 9 Induced gamma emission — In physics, induced gamma emission (IGE) refers to the process of fluorescent emission of gamma rays from excited nuclei, usually involving a specific nuclear isomer. It is analogous to conventional fluorescence, which is defined to be the… …

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  • 10 positron emission tomography — (PET, positron emission computed tomography, PECT) a technique in nuclear medicine for cross sectional imaging that enables a noninvasive assessment and localization of metabolic activity to be made. Emission of a positron by a radioisotope… …

    Medical dictionary

  • 11 positron emission tomographypositron emission comp — PET; = PECT a technique in nuclear medicine for cross sectional imaging that enables a noninvasive assessment and localization of metabolic activity to be made. Originally used to study activity in the brain, PET is now also used for… …

    The new mediacal dictionary

  • 12 Neutron stimulated emission computed tomography — (NSECT) uses induced gamma emission through neutron inelastic scattering to generate images of the spatial distribution of elements in a sample.[1] Contents 1 NSECT mechanism 2 Clinical Applications …

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  • 13 Positron emission — is a type of beta decay, sometimes referred to as beta plus ( beta;+). In beta plus decay, a proton is converted, via the weak force, to a neutron, a positron (also known as the beta plus particle , the antimatter counterpart of an electron), and …

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  • 14 Atomic emission spectrum — The atomic emission spectrum of an element is the set of frequencies of the electromagnetic waves emitted by atoms of that element. Each atom s atomic emission spectrum is unique and can be used to determine if that element is part of an unknown… …

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  • 15 Soft X-ray emission spectroscopy — is an experimental technique for determining the electronic structure of materials. It is a form of X ray spectroscopy.UsesX ray emission spectroscopy (XES) provides a means of probing the partial occupied density of electronic states of a… …

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  • 16 Gamma ray burst emission mechanisms — are theories that explain how the energy from a gamma ray burst progenitor (regardless of the actual nature of the progenitor) is turned into radiation. These mechanisms are a major topic of research as of 2007. Neither the light curves nor the… …

    Wikipedia

  • 17 electron emission — Synonyms and related words: Becquerel ray, Grenz ray, Roentgen ray, X radiation, X ray, actinic ray, alpha radiation, alpha ray, anode ray, beta radiation, beta ray, canal ray, cathode glow, cathode ray, collision emission, cosmic radiation,… …

    Moby Thesaurus

  • 18 cascade gamma rays — pakopinė gama spinduliuotė statusas T sritis fizika atitikmenys: angl. cascade gamma rays; successive gamma rays vok. Kaskaden Gamma Strahlen, m; Kaskaden Gamma Strahlung, f rus. каскадное гамма излучение, n; каскадные гамма лучи, m pranc.… …

    Fizikos terminų žodynas

  • 19 successive gamma rays — pakopinė gama spinduliuotė statusas T sritis fizika atitikmenys: angl. cascade gamma rays; successive gamma rays vok. Kaskaden Gamma Strahlen, m; Kaskaden Gamma Strahlung, f rus. каскадное гамма излучение, n; каскадные гамма лучи, m pranc.… …

    Fizikos terminų žodynas

  • 20 positron emission tomography — (PET) tomography accomplished by detection of gamma rays emitted from tissues after administration of a natural biochemical substance (e.g., glucose, fatty acids) into which positron emitting isotopes have been incorporated. The paths of the… …

    Medical dictionary