ET ASNT LEVEL I EXAM 2025 | LATEST VERSION | COMPLETE QUESTION SET WITH ACCURATE & DETAILED VERIFIED ANSWERS | 100% CORRECT | GRADED A+

ET ASNT LEVEL I EXAM 2025 | LATEST VERSION | COMPLETE QUESTION SET WITH ACCURATE & DETAILED VERIFIED ANSWERS | 100% CORRECT | GRADED A+ What is sometimes used to change the alternating current from a high-voltage transformer to direct current for the purpose of increasing the X-ray machine output? a. Rectifier. b. Cathode X-ray tubes. c. Gas X-ray tube. d. Vacuum X-ray tube. a. Rectifier. In X-radiography, the ability to penetrate the test object is governed by: a. source-to-film distance. b. time. c. kilovoltage. d. milliamperage. c. kilovoltage. Which of the following types of radiation is emitted by Co-60 and used in nondestructive testing? a. Neutrons. b. Gamma rays. c. X-rays. d. Alpha particles. b. Gamma rays. The term used to describe the loss of excess energy by the nucleus of radioactive atoms is called: a. decay (disintegration). b. ionization. c. scintillation. d. activation. a. decay (disintegration). The penetrating ability of an X-ray beam is governed by: a. kilovoltage. b. time. c. milliamperage. d. source-to-film distance a. kilovoltage. Co-60 used in nondestructive testing emits: a. alpha particles. b. neutrons. c. gamma rays. d. X-rays. c. gamma rays. A densitometer is an instrument for measuring: a. X-ray intensity. b. film density. c. density of a material. d. tube current. b. film density. Three liquids which are essential to process an exposed film properly are: a. stop bath, acetic acid, and water. b. developer, stop bath, and H2O2. c. developer, fixer, and water. d. acetic acid, fixer, and stop bath. c. developer, fixer, and water. The two most common causes for excessively high-density radiographs are: a. insufficient washing and overdevelopment. b. contaminated fixer and insufficient washing. c. overexposure and contaminated fixer. d. overexposure and overdevelopment. d. overexposure and overdevelopment. The time required for one-half of the atoms in a particular sample of radioactive material to disintegrate is called: a. the inverse square law. b. a curie. c. a half-life. d. the exposure time. c. a half-life. What does R/h refer to? a. Radiation limits for humans. b. Roentgen per hour. c. X-rays per hour. d. Radiation in hydrogen. b. Roentgen per hour. The ability to detect a small detail is called radiographic: a. contrast. b. sensitivity. c. density. d. resolution. b. sensitivity. The term used to express the number of curies (becquerels) of radioactivity per ounce or gram of source weight is: a. decay. b. emissivity. c. specific activity. d. source output. c. specific activity. The unit of measurement used for the output of a gamma-ray source is the: a. curie (becquerel). b. roentgen (sievert). c. half-life. d. MeV. a. curie (becquerel). Exposure to X-rays or gamma rays: a. may have a cumulative effect which must be considered. b. will be beneficial since they build up an immunity to radiation poisoning. c. will have no effect on human beings. d. will have only a short-term effect on human tissues. a. may have a cumulative effect which must be considered. Which dose would be most dangerous, if not fatal, if applied to the entire body in a short period of time? a. 0-25 R (0-250 mSv). b. 25-100 R (250-1000 mSv). c. 400-600 R ( mSv). d. 600 R or more (6000 mSv or more). d. 600 R or more (6000 mSv or more). When doing gamma-ray radiography with high-intensity emitters, the sources are best handled: a. directly by personnel equipped with special protective clothing. b. by remote handling equipment. c. directly by personnel with special protective clothing except when radiographs are being made. d. by the same methods used for low-intensity emitters. b. by remote handling equipment. If a film is placed in a developer solution and allowed to develop without any agitation: a. the radiograph may not show proper contrast. b. it will be impossible to fix the radiograph permanently. c. there will be a general fogging condition over the entire radiograph. d. uneven development or streaking could occur. d. uneven development or streaking could occur. The selection of the proper type of film to be used for the X-ray examination of a particular part depends on: a. the thickness of the part. b. the material of the specimen. c. the voltage range of the available X-ray machine. d. quality of radiograph or exposure time. d. quality of radiograph or exposure time. A Co-60 source has a half-life of: a. 1.2 years. b. 6 months. c. 5.27 years. d. 74.3 days. c. 5.27 years. X-ray tube current is controlled by the: a. current passing through the filament. b. distance from the cathode to the anode. c. type of material used in the target. d. voltage and waveform applied to the X-ray tube. a. current passing through the filament. Lead foil in direct contact with X-ray film: a. intensifies the scatter radiation more than the primary radiation. b. decreases the contrast of the radiographic image. c. intensifies the primary radiation more than the scatter radiation. d. should not be used when gamma rays are emitted by the source of radiation. c. intensifies the primary radiation more than the scatter radiation. Lead intensifying screens are usually mounted in pairs in rigid holders called: a. film racks. b. cassettes. c. emulsifiers. d. diaphragms. b. cassettes. In order to decrease geometric unsharpness: a. radiation should proceed from as small a focal spot as other considerations will allow. b. radiation should proceed from as large a focal spot as other considerations will allow. c. the film should be as far as possible from the object being radiographed. d. the distance from the anode to the material examined should be as small as is practical. a. radiation should proceed from as small a focal spot as other considerations will allow.