| 释义 |
scintillation
scin·til·la·tion S0148500 (sĭn′tl-ā′shən)n.1. The act of scintillating.2. A spark; a flash.3. Astronomy Rapid variation in the light of a celestial body caused by turbulence in Earth's atmosphere; a twinkling.4. Physics A flash of light produced in a phosphor by absorption of an ionizing particle or photon.scintillation (ˌsɪntɪˈleɪʃən) n1. the act of scintillating2. a spark or flash3. (Astronomy) the twinkling of stars or radio sources, caused by rapid changes in the density of the earth's atmosphere, the interplanetary medium, or the interstellar medium, producing uneven refraction of starlight4. (General Physics) physics a flash of light produced when a material scintillatesscin•til•la•tion (ˌsɪn tlˈeɪ ʃən)
n. 1. the act of scintillating. 2. a spark or flash. 3. the twinkling or tremulous effect of the light of the stars. 4. a flash of light from the ionization of a phosphor struck by an energetic photon or particle. [1615–25; < Medieval Latin scintillātiō twinkling of the stars. See scintillate, -tion] scintillationthe process of giving of sparks or flashes, used of wit or humor and of the twinkling of the stars.See also: ProcessesThesaurus| Noun | 1. | scintillation - (physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particlenatural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"light, visible light, visible radiation - (physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window" | | 2. |  scintillation - a rapid change in brightness; a brief spark or flashsparkling, twinklealteration, change, modification - an event that occurs when something passes from one state or phase to another; "the change was intended to increase sales"; "this storm is certainly a change for the worse"; "the neighborhood had undergone few modifications since his last visit years ago" | | 3. | scintillation - a brilliant display of witgenius, brilliance - unusual mental ability | | 4. |  scintillation - the quality of shining with a bright reflected lightglisten, glister, glitter, sparklebrightness - the location of a visual perception along a continuum from black to white | | 5. | scintillation - the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlightwavering, fluctuation - the quality of being unsteady and subject to changes; "he kept a record of price fluctuations" |
scintillationnounSparkling, brilliant light:flash, glint, glisten, glister, glitter, shimmer, sparkle.Translationsscintilliosfavillioscintillazionescintillation
scintillation (sin-tă-lay -shŏn) (twinkling) Rapid irregular variations in the brightness of light received from celestial objects, noticeably stars, produced as the light passes through the Earth's atmosphere: irregularities in the atmosphere's refractive index occur in small mobile regions and can cause the direction of the light to change very slightly during its passage. In a telescope a star image will consequently wander rapidly about its mean position, producing an overall blurred enlarged image. With extended light sources, such as the planets, scintillation produces a hazy outline in a telescopic image. For stars near the horizon, where refraction effects including dispersion are much greater, changes in color can also be observed. See also scattering; speckle interferometry.Scintillation a brief (~10–4–10–9 sec) flash of light that occurs in a scintillator under the action of ionizing radiation. Scintillations were first visually observed by W. Crookes in 1903, when he irradiated a zinc sulfide screen with alpha particles. The energy of the charged particles that is absorbed by the scintillator causes the atoms or molecules of the scintillator to undergo a transition to an excited state. The subsequent transition from the excited state back to the normal state is accompanied by the emission of light—that is, by a scintillation. The scintillation mechanism, the spectrum of the scintillation radiation, and the emission time depend on the nature of the luminescent substance. The brightness of the scintillation depends on the nature of the charged particles and on the energy given up by the particle during its passage through the substance. For example, scintillations produced by alpha particles and protons are considerably brighter than scintillations produced by beta particles. Each scintillation is produced by a single particle. This fact is made use of in scintillation counters for the detection of elementary particles. scintillation[‚sint·əl′ā·shən] (electromagnetism) A rapid apparent displacement of a target indication from its mean position on a radar display; one cause is shifting of the effective reflection point on the target. Also known as target glint; target scintillation; wander. Random fluctuation, in radio propagation, of the received field about its mean value, the deviations usually being relatively small. (lapidary) The flashing, twinkling, or sparkling of light, or the alternating display of reflections, from the polished facets of a gemstone. (nucleonics) A flash of light produced in a phosphor by an ionizing particle or photon. (optics) Rapid changes of brightness of stars or other distant, celestial objects caused by variations in the density of the air through which the light passes. Rapid changes in the values of irradiance over the cross section of a laser beam. scintillation
scintillation [sin″tĭ-la´shun] 1. the emission of sparks.2. the sensation of sparks before the eyes.3. a particle emitted in disintegration of a radioactive element.scin·til·la·tion (sin'ti-lā'shŭn), 1. Flashing or sparkling; a subjective sensation as of sparks or flashes of light.
See also: scintillation counter. 2. In radiation measurement, the light produced by an ionizing event in a phosphor, as in a crystal or liquid scintillator.
See also: scintillation counter. [L. scintilla, a spark] scin·til·la·tion (sin'ti-lā'shŭn) 1. Flashing or sparkling; a subjective sensation as of sparks or flashes of light. 2. In radiation measurement, the light produced by an ionizing event in a phosphor, as in a crystal or liquid scintillator.
See also: scintillation counter[L. scintilla, a spark]Scintillation or gamma cameraA camera, somewhat like an x-ray machine, used to photograph internal organs after the patient has been injected with a radioactive material.Mentioned in: Gallbladder Nuclear Medicine Scanscintillation
Related to scintillation: Scintillation detector, ionospheric scintillationSynonyms for scintillationnoun sparkling, brilliant lightSynonyms- flash
- glint
- glisten
- glister
- glitter
- shimmer
- sparkle
Synonyms for scintillationnoun (physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particleRelated Words- natural philosophy
- physics
- light
- visible light
- visible radiation
noun a rapid change in brightnessSynonymsRelated Words- alteration
- change
- modification
noun a brilliant display of witRelated Wordsnoun the quality of shining with a bright reflected lightSynonyms- glisten
- glister
- glitter
- sparkle
Related Wordsnoun the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlightRelated Words |