ASNT RT I EXAM GUIDE GRADED A QUESTIONS AND ANSWERS 2024

Although there may be other reasons for using calcium tungstate screens in industrial radiography, they are most usually used to: - Decrease exposure time In film radiography, pentrameters are usually placed: - on the source side of the test object The penetrating ability of an x-ray beam is governed by: - Kilovoltage Co-60 used in nondestructive testing emits: - Gamma rays A densitometer is an instrument for measuring: - film density Three liquids which are essential to process an exposed film properly are: - Developer, fixer and water The two most common causes for excessively high-density radiographs are: - overexposure and underdevelopment the time required for one-half of the atoms in a particular sample of radioactive material to disintegrate is called: - a half- life What does the term R/h refer to when speaking of intensity? - Roentgens per hour The ability to detect a small discontinuity or flaw is called: - radiographic sensitivity Movement, geometry, and screen contact are three factors that affect radiographic: - unsharpness The difference between the densities of two areas of a radiograph is called: - radiographic contrast The most widely used unit of measurement for measuring the rate at which the output of a gamma ray source decays is the: - curie Exposure to x-rays or gamma rays will have what effect on the body? - It may have a cumulative effect which must be considered Which dose would be dangerous, if not fatal, if applied to the entire body in a short period of time? A. 1.5 - 15R B. 25 - 70R C. 200 - 800R D. All of the above doses would most likely be fatal - C. 200 - 800 R When doing gamma ray radiography with high- intensity emitters, the sources are best handled: - by remote handling equipment If a film is placed in a developer solution and allowed to develop without any agitation: - There will be a tendency for areas to affect each other The selection of the proper type of film to be used for the x-ray examination of a particular part depends on: - the thickness of the part, the material of the specimen, the voltage range of the available x-ray machine A Co-60 source has a half life of: - 5.3 Years x-ray tube current is controlled by: - the current passing through the filament The voltage and waveform applied to the x-ray tube by a high- voltage transformer primarily determines the: - penetrating ability lead foil in direct contact with x-ray film: - Intensifies the primary radiation more than the scatter radiation Fluorescent intensifying screens are usually mounted in pairs in rigid holders called: - Cassettes Radiographic sensitivity, in the context of the minimum detectable flaw size, depends on: - graininess of the film, the unsharpness of the flaw image in the film and the contrast the flaw image on the film In order to decrease geometric unsharpness: - Radiation should proceed from as small a focal spot as other considerations will allow