T.O. 33B-1-1Glossary 16CONTACT TESTING (UT): Testing with transducer assembly in direct contact with material through a thin layer ofcouplant.CONTACT TRANSDUCER: A transducer that is coupled to a test surface either directly or through a thin film ofcouplant.CONTAINER, GAMMA-RAY SOURCE (RT): A device for housing radionuclides and giving a required degree ofprotection against radiation. (This may take the form of an exposure device or a storage container.)CONTAMINATION (PT, MT): Any material in the wet suspension other than the liquid vehicle and the magneticmaterial being used. This could be shop dust, lint, soil from improperly cleaned parts, oil, etc.CONTAMINATION (RT): The presence of unwanted radioactive matter, or the “Soiling” of object or materials with“Radioactive Dirt.”CONTINUOUS METHOD (MT): The method in which the inspection medium is applied while the magnetizingcurrent is on.CONTINUOUS SPECTRUM (RT): The characteristic radiation pattern that exhibits energies for an unbroken series offrequencies over a wide range.CONTINUOUS WAVE (UT): Steady generation of ultrasonic energy; opposite of pulsed.CONTINUOUS WEDGE (RT): A wedge, the thickness of which varies continuously.CONTRACTED SWEEP (UT): A contraction of the horizontal sweep line or time axis on the viewing screen of theultrasonic instrument. A contraction of this sweep permits viewing defect or back reflection occurring over a greaterlength of time.CONTRAST AGENT (RT): Any suitable substance, solid, liquid, or gas, applied to a material being radiographed, toenhance its contrast in total or in part.CONTRAST RATIO (PT, MT): The relative amount of light emitted or reflected as between an indication and itsbackground.CONTRAST RATIO (RT): The relative amount of light emitted or reflected as between an indication and itsbackground.CONTRAST (MT, PT, RT): The difference in visibility between an indication and the surrounding surface.CONTRAST, FILM (RT): Change in density that results from a given change in incident radiation. Determined fromthe slope of the characteristic curve. See FILM GAMMA.CONTRAST, RADIOGRAPHIC (RT): The difference in density between an image and its immediate surroundings ona radiograph.CONTRAST, SUBJECT (RT): The ratio (or logarithm of the ratio) of the radiation intensities transmitted by selectedportions of the specimen.CONTROL ECHO (UT): Reference signal from constant reflecting surface, such as the back reflection from a smooth,regular back surface.CONTROL PANEL (RT): A console or unit that contains the controls necessary to operate a radiation source and anyancillary equipment used for radiography.
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