T.O. 33B-1-1Glossary 66PROCESS CONTROL: Is a general term used to encompass the actions and documentation, as required by officialdirectives or logic, that are necessary for a NDI method to be effective in detecting conditions of interest (e.g., cracks,foreign objects, corrosion, alignment of parts, thickness of parts/coating and pressure/vacuum leaks).PROCESSING DEFECTS: Defects occurring in the material during any of the processing stages from molten metal tothe finished product.PROCESSING, FILM (RT): A series of operations, such as developing, fixing, and washing, associated with theconversion of a latent image into a stable visible image.PROCESSING UNIT (RT): A series of tanks forming a single unit for holding chemical solutions used duringprocessing.PROCESS INSPECTION: To establish correct manufacturing procedure by inspection methods, and then by periodicinspection to insure that the process continues to operate correctly.PRODS (MT): Hand held electrodes attached to cables to transmit the magnetizing current from the source to the partbeing inspected.PROGRESSIVE AGING: Aging by increasing the temperature in steps or continuously during the aging cycle.PROGRESSIVE FORMING: Sequential forming at consecutive stations either with a single die or with separate dies.PROJECTOR (RT): See exposure device.PROOF LOAD: A predetermined load, generally some multiple of the service load, to which a specimen or structure issubmitted before acceptance for use.PROOF STRESS:(1) The stress that will cause a specified small permanent set in a material.(2) A specified stress to be applied to a member or structure to indicate its ability to withstand service loads.PROPAGATION: Advancement of a wave through a medium.PROPORTIONAL LIMIT: The maximum stress at which strain remains directly proportional to stress.PROTECTIVE APRON (RT): Apron made of attenuating materials, used to reduce radiation exposure.PROTECTIVE MATERIAL (RT): Shielding material used for the purpose of radiation protection.PROTON: An elementary particle with a single positive electrical charge and a mass approximately 1847 times that ofthe electron. The atomic number of an atom is equal to the number of protons in its nucleus.PSIGG: Pounds per square inch; gauged air pressure gauged by a regulator.PT: Symbol for the liquid penetrant method of nondestructive testing/inspection.PUBLIC DOSE: The dose received by a member of the public from exposure to radiation.PULL CRACKS: In a casting, cracks that are caused by residual stresses produced during cooling, and that result fromthe shape of the object.
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