T.O. 33B-1-1Glossary 72RECEIVER (UT): Search unit or transducer element, used to receive ultrasonic energy from a test part.RECESS: A groove or depression in a surface.RECIPROCITY LAW (RT): Law that states that the film blackening is determined by the product of the milliamperageor source strength and the time of exposure. See RECIPROCITY LAW FAILURE.RECIPROCITY LAW FAILURE (RT): A term used to describe situations in which the reciprocity law is notapplicable. For very short or very long exposures, problems with film response time can cause the reciprocity law tofail.RECORDING MEDIUM (RT): A photographic film or other material that converts radiation energy into a permanentvisible image.RECOVERY TIME: The time required for a test system to return to its original state after it has received a signal.RECRYSTALLIZATION:(1) The change from one crystal structure to another, as occurs on heating or cooling through a criticaltemperature.(2) The formation of a new, strain-free grain structure from that existing in cold worked metal, usuallyaccomplished by heating.RECTIFICATION: Any method by which a unidirectional voltage can be obtained from an alternating supply.RECTIFIED ALTERNATING CURRENT: By means of a device called a rectifier, which permits current to flow inone direction only, alternating current can be converted to direct or unidirectional current. This differs from directcurrent in that the current value varies from a steady level. This variation may be extreme, as in the case of half-waverectified single-phase AC or slight, as in the case of three-phase rectified ACRECTIFIER: A tube or circuit capable of converting the high voltage alternating waveform into a usable unidirectionalvoltage waveform.REDUCTION:(1) In cupping and deep drawing, a measure of the percentage decrease from blank diameter to cupdiameter or of diameter reduction in redraws.(2) In forging, rolling and drawing, either the ratio of the original to final cross-sectional area or thepercentage decrease in cross-sectional area.REDUCTION FACTOR: Dose rate without a shield divided by the dose rate with a shield interposed between a sourceand a point at which radiation is measured.REDUCTION OF AREA:(1) Commonly, the difference expressed as a percentage of original area, between the original cross-sectionalarea of a tensile test specimen and the minimum cross-sectional area measured after complete separation. (2) Thedifference expressed as a percentage of original area, between original cross-sectional area and that after straining thespecimen.
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