T.O. 33B-1-1Glossary 25(1)Stretching a relatively small, shallow indentation into sheet metal.(2)In aircraft, stretching metal into a conical flange for the use of a countersunk head rivet.DIP RINSE (PT): A means of removing excess penetrant in which the test parts are dipped into an agitated tank ofwater or remover.DIRECT CURRENT: Electric current flowing continuously in one direction through a conductor. Such current isfrequently referred to as DC.DIRECT FILM (RT): See non-screen film.DIRECTIONAL PROPERTIES: Properties whose magnitude varies depending on the relation of the test axis to thespecific direction within the metal. The variation results from preferred orientation or from fibering of constituents orinclusions.DISCERNABLE IMAGE: Image capable of being recognized by sight without the aid of magnification; correctedvision excepted.DISCONTINUITY: An interruption in the normal physical structure or configuration of a part such as cracks, laps,seams, inclusions, porosity. A discontinuity may or may not affect the usefulness of a part. See DEFECT.DISINTEGRATION, NUCLEAR: A spontaneous nuclear transformation (radioactivity) characterized by the emissionof energy and/or mass from the nucleus.DISLOCATION: A linear defect in a crystal or lattice of a material. The two basic types are edge and screw.DISPERSANT (PT): A substance for promoting the formation and stabilization of dispersed particles of one substancein another.DISPERSION, SOUND: Scattering of rays of an ultrasonic beam as a result of reflection from a highly irregularincident surface above that normally associated with a particular transducer.DISTANCE AMPLITUDE CORRECTION (UT): Compensation for variance in amplitude from equal reflectors atdifferent sound travel distances. The abbreviation is DAC. Also used to denote electronic change of amplification toprovide equal amplitude from equal reflectors at different sound travel distances. Other designations for this electronicchange of amplification are Swept Gain (SG), Time Corrected Gain (TCG), Time Variable Gain (TVG) and SensitivityTime Control (STC).DISTORTED FIELD (MT): The direction of a magnetic field in a symmetrical object will be substantially uniform ifproduced by a uniformly applied magnetizing force, as in the case of a bar magnetized in a solenoid. But if the piecebeing magnetized is irregular in shape, the field is distorted and does not follow a straight path or have a uniformdistribution.DOSE OR RADIATION DOSE: A generic term that means absorbed dose, dose equivalent, etc. And represents thetotal amount of radiation received during the applicable period of exposure.DOSE EQUIVALENT: The product of the absorbed dose in tissue, quality factor, and all other necessary modifyingfactors at the location of interest. The units of dose equivalent are the rem and Sievert (Sv).DROSS: The scum that forms on the surface of molten metals largely because of oxidation but sometimes because ofthe rising of impurities to the surface.DRY DEVELOPER (PT): A developer powder that is applied as a dust without a liquid carrier.
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