T.O. 33B-1-1Glossary 46INSPECTION (MT): Visually observing, or looking at the surface of a part after it has been magnetized and magneticparticles applied to assure that the part is free of discontinuities.INTENSIFYING SCREEN (RT): A layer of material that, when placed in contact with a photographic film, improvesthe efficiency of the photographic action of ionizing radiation on the film emulsion. The increased rate of absorption ofradiation energy by the emulsion enables reduction of exposure time.INTENSITY, RADIATION (RT): The amount of energy passing per unit time per unit area at a point in a beam ofradiation, the area being perpendicular to the direction of propagation.INTERACTION (RT): Any process in which all or part of the energy of incident radiation is transferred to theelectrons or nuclei of the atoms that constitute matter, or in which only the direction of the incident particle is altered.INTERFACE: The physical boundary between two adjacent surfaces.INTERGRANULAR CORROSION: Corrosion occurring preferentially at grain boundaries.INTERLOCK (RT): A device for precluding access to an area of radiation hazard either by preventing entry or byautomatically removing the hazard.INTERMEDIATE LAYER METHOD (ET): A method of liftoff compensation where the same eddy current indicationis obtained from bare metal and at a predetermined distance from the bare metal using a nonconductive shim(intermediate layer).INTERNAL COIL (ET): A coil wound upon a bobbin and having a cross-sectional configuration close to that of theinternal bore or passage of the test object.INTERNAL CONVERSION (RT): The transfer of nuclear energy directly to a bound electron in the same atom, whichcauses the electron to be ejected from the atom. Subsequent filling of the vacancy thus created results in the emissionof characteristic X-rays or auger electrons.INTERNAL STRESSES: Unseen forces existing within a part. These are forces that exist without the part beingsubjected to a working load.INTERPRETATION (Evaluation): The determination of the cause of an indication or the evaluation of the significanceof discontinuities from the standpoint of whether they are detrimental defects or superficial blemishes.INTERPRETATION (MT): The determination of what condition in the part has caused the magnetic particle pattern.INTERSTITIAL SOLID SOLUTION: An alloy in which small atoms of alloying elements including carbon, nitrogenor hydrogen assume positions between the lattice sites normally occupied by the base metal.INVERSE SQUARE LAW (RT): At constant kilovoltage or source strength, the intensity of the radiation reaching theobject is governed by the distance between the focal spot or radioactive source and the object, varying inversely with thesquare of the distance.INVERSE VOLTAGE (RT): A voltage that may appear across an X-ray tube or rectifier during one half-cycle of analternating current and that reverses the polarity of the electrodes relative to the previous half-cycle.INVESTMENT CASTING:(1) Casting metal into a mold produced by surrounding (investing) in expendable pattern with a refractoryslurry that sets at room temperature after which the wax, plastic or frozen mercury pattern is removed through the useof heat. Also called precision casting or lost-wax process.
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