x-ray emission
101X-ray laser — X ray laser, a device that amplifies X rays by stimulated emission to produce a beam of greater penetrating power than that of a regular laser beam: »It took longer to develop the technology that could create X ray lasers because they require a… …
102Self-Amplified Stimulated-Emission — Self Amplified Spontaneous (or Stimulated) Emission (SASE) is a process within a Free electron laser (FEL) by which a laser beam is created by the high energy electron beam. The lasing starts up from the random microbunching (i.e., shot noise) on …
103positron-emission tomography — n tomography in which an in vivo, noninvasive, cross sectional image of regional metabolism is obtained by a usu. color coded cathode ray tube representation of the distribution of gamma radiation given off in the collision of electrons in cells… …
104Cathode ray — Cathode rays (also called an electron beam or e beam) are streams of electrons observed in vacuum tubes, i.e. evacuated glass tubes that are equipped with at least two electrodes, a cathode (negative electrode) and an anode (positive electrode)… …
105X-ray fluorescence emission spectrometer — An x ray crystal spectrometer used to measure wavelengths of xray fluorescence; in order to concentrate beams of low intensity, it has bent reflecting or transmitting crystals arranged so that the theoretical curvature required can be varied… …
106actinic ray — noun electromagnetic radiation that can produce photochemical reactions • Syn: ↑actinic radiation • Hypernyms: ↑electromagnetic radiation, ↑electromagnetic wave, ↑nonparticulate radiation • Hyponyms: ↑ …
107beta ray — noun radiation of beta particles during radioactive decay • Syn: ↑beta radiation, ↑electron radiation • Hypernyms: ↑corpuscular radiation, ↑particulate radiation, ↑ionizing radiation * * * noun …
108positron emission tomography — the process of producing a PET scan. Cf. PET scanner. * * * ▪ imaging technique imaging technique used in diagnosis and biomedical research. It has proved particularly useful for studying brain and heart functions and certain biochemical… …
109X-ray fluorescence — noun The emission of electrons from a material when exposed to X rays …
110beta ray microscope — a microscope that reveals emission of beta particles from a microscopic specimen by means of a scintillator …
