T.O. 33B-1-1Glossary 23DETECTOR (RT): A device that determines the presence of ionizing radiation.DETERGENT REMOVER (PT): A penetrant remover that is a solution of a detergent in water.DEUTERIUM: The isotope of hydrogen having one proton, one neutron, one electron, and an AMU of two.DEVELOPER DRY (PT): A light fluffy dry absorbent powder, applied to the part being penetrant inspected after theexcess surface penetrant has been removed and the part has been dried. The “Dry” developer adheres primarily to theflaw openings wetted by the penetrant liquid, to obtain increased bleed out of the penetrant and provide sharp flawdelineations.DEVELOPER (PT): Material, wet or dry, which will draw or absorb penetrant from a surface crack or defect to theextent the defect will be visible under natural, artificial, or black light, as applicable. Developers also control thebackground of the high contrast penetrant color system.DEVELOPER (RT): A chemical solution that reduces exposed silver halide crystals to metallic silver.DEVELOPER, NON.AQUEOUS (PT): Absorbent powdered materials suspended in a non-aqueous liquid, used toprovide a white background for maximum color contrast, and to enhance the bleed out of the penetrant from the flawcavity to obtain increased accuracy of penetrant inspection.DEVELOPER, SOLUBLE (PT): A developer completely soluble in its carrier, not a suspension of powder in a liquid,which dries to an absorptive coating.DEVELOPER, SOLVENT: A developer consisting of fine particles suspended in a volatile solvent. The volatilesolvent helps dissolve the penetrant out of the discontinuity and bring it to the surface.DEVELOPER, WET (PT): An absorbent powder supplied in the dry form to be mixed and suspended in water forapplication to the part being penetrant inspected, after the excess surface penetrant has been removed. The “Wet”developer, on drying, provides an absorbent white background to the part for maximum color contrast, and enhancesthe bleed out of the penetrant from the flaw cavity to obtain increased inspection accuracy.DEVELOPING AGENT (RT): The constituent of a developer that reduces sufficiently exposed silver halide grains tometallic silver at a greater rate than unexposed or insufficiently exposed grains.DEVELOPING TIME (PT): The elapsed time necessary for the applied developer to bring out indications frompenetrant entrapments. Usually one-half the penetrant dwell time.DEVELOPMENT (RT): The conversion of a latent image into a visible image by treatment of the film emulsion with asuitable chemical solution (developer).DEZINCIFICATION: Corrosion of some copper-zinc alloys involving loss of zinc and formation of a spongy porouscopper.DIAMAGNETIC: A material that has less magnetic permeability than a vacuum. Although diamagnetic materialshave relative magnetic permeabilities slightly less than 1, the amount of difference is insignificant in eddy currenttesting and diamagnetic material are classified as nonmagnetic with a relative permeability of 1.DICHROIC FOG (RT): Fog caused by the deposition of a very thin layer of finely divided silver on an emulsion, whichwhen examined in white light, appears in two colors, red by transmission and green by reflection.DIE: Various tools used to impart shape to material primarily because of the shape of the tool itself. Examples areblanking dies, cutting dies, drawing dies, forging dies, punching dies, and threading dies.
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