T.O. 33B-1-1Glossary 93TRANSDUCER (UT): An electroacoustical device for converting electrical energy into acoustical energy and viceversa.TRANSDUCER ELEMENT (UT): A piezoelectric element in a search unit.TRANSFER: Compensation for differences in signal amplitude from equivalent reflectors in a test part and thereference standard used in an inspection.TRANSIENT CURRENTS: These currents are of short duration, generated by sudden changes in the electrical ormagnetic conditions existing in an electrical or magnetic circuit.TRANSMISSION ANGLE (UT): The incident angle of the transmitted ultrasonic beam. It is zero degrees when theultrasonic beam is perpendicular to the test surface.TRANSMISSION CHARACTERISTICS (UT): Test part characteristics that influence the transmitting and receivingof ultrasonic energy in an inspection; includes surface effects and internal effects.TRANSMISSION TARGET (RT): A relatively thin target so arranged that the X-ray beam emerges from the surfaceopposite that on which the electron stream is incident.TRANSMITTER (UT): Search unit or transducer element, used to generate ultrasonic energy to be transmitted into atest part.TRANSVERSE: Literally, “across,” usually signifying a direction or plane perpendicular to the direction of working.TRANSVERSE WAVE (UT): See SHEAR WAVE.TREES: Visible projections of electrodeposited metal formed at sites of high current density.TREPANNING: A type of boring where an annular cut is made into a solid material with the coincidental formation ofa plug or solid cylinder.TRITIUM: A radioactive isotope of hydrogen with two neutrons and one proton in the nucleus. It is heavier thandeuterium (heavy hydrogen). Tritium is used in industrial thickness gages, as a label in tracer experiments, and incontrolled fusion experiments.TUBE CURRENT (RT): The current flowing between the cathode and anode during the generation of radiation by anX-ray tube.TUBE DIAPHRAGM (RT): An adjustable device, normally attached to a tube housing, that limits the cross section ofthe emergent X-ray beam.TUBE FILTER (RT): A filter that can be attached to the X-ray tube housing.TUBE HOUSING (RT): An enclosure that contains an X-ray tube and has a port through which the useful beam isemitted. The tube housing may also contain transformers and other appropriate components.TUBE RATING (RT): The maximum electrical power (in watts) that can be safely applied to an X-ray tube for aspecified period.TUBE SHIELD (RT): The housing of an X-ray tube that normally provides protection against electric shock andaffords a degree of protection against radiation.TUBE-SHIFT RADIOGRAPHY (RT): See TRIANGULATION.
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