T.O. 33B-1-1Glossary 79SCATTERED ENERGY (UT): Energy that is reflected in a random fashion by small discontinuities in the path of asound beam.SCATTERED RADIATION (RT): Radiation that, as the result of interaction with matter, has had its direction changedand, for some interactions, its energy decreased.SCATTERING (RT): A change of direction, and possibly reduction of energy, of an incident particle or photon as theresult of interaction with an atom, nucleus, or other particle.SCATTERING ANGLE (RT): The angle between the directions of propagation of the incident and scattered radiation.SCHLIEREN SYSTEM (UT): An optical system used to visually display an ultrasonic beam passing through atransparent medium.SCHWARZCHILD EXPONENT (RT): A mathematical index that may be applied to one of the variables in order tocorrect for the failure of the reciprocity law over a limited range.SCINTILLATION (RT): A localized flash of light caused by a particle or photon of ionizing radiation incident on afluorescent material.SCINTILLATION COUNTER: A device for counting atomic particles by means of tiny flashes of light (scintillations)which the particles produce when they strike certain crystals.SCINTILLATOR (RT): A substance that emits a localized flash of light when excited by an incident particle or photonof ionizing radiation.SCLEROSCOPE TEST: A hardness test where the loss in kinetic energy of a falling metal “tup,” absorbed byindentation upon impact of the tup on the metal being tested, is indicated by the height of rebound.SCORING:(1)Marring or scratching of any formed part by metal pickup on the punch or die.(2)Reducing the thickness of a material along a line to weaken it purposely along that line.SCOTCH TAPE TRANSFER (MT): The use of colorless tape to lift a magnetic particle indication from a part.SCRATCH: A shallow mark or injury produced by abrasion.SCRATCH HARDNESS: The hardness of a metal determined by the width of a scratch made by a cutting point drawnacross the surface under a given pressure.SCREEN (RT): Alternative term for intensifying screen.SCREENS, FLUORESCENT (RT): See FLUORESCENT SCREENS.SCREENS, INTENSIFYING (RT): See INTENSIFYING SCREENS.SCREENS, LEAD (RT): Layers of lead foil, used in intimate contact with the film during exposure. They act toimprove radiographic quality or to decrease exposure time, or both.SCREEN MOTTLE (RT): (Fluorescent Screen Exposures) The visual impression of irregularity of density, in areaswhere the exposure is macroscopically uniform, due to the random spatial distribution of X-ray quanta absorbed in thescreens. Screen mottle is much larger in scale and “softer” in outline than film graininess. See FILM GRAININESS.
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