ARRT LIMITED SCOPE OF PRACTICE IN RADIOGRAPHY EXAMINATION (CORE) PRACTICE QUESTIONS AND ANSWERS 2023 which of the following statements are correct regarding the link between radiation dose and genetic effects? - Answer The link has been demonstrated in animal studies. Increased risk to humans cannot be predicted with respect to an individual. Which of th e following changes in kilovoltage (kVp) will result in the greatest reduction of patient dose, when miliampere -seconds (mAs) is adjusted to compensate for the change? - Answer increase kVp by 30% Which radiographic imaging system uses storage phosphors t o temporarily store energy representing the image signal? - Answer computer radiography What is the primary purpose of using gonad shields during radiography? - Answer Reduce the likelihood of genetic effects. which of the following are types of gonad sh ields? - Answer Contact and shadow when should gonad shielding be used? - Answer when the gonads are within 5 cm. of the radiation field. The greatest cause of unnecessary radiation to patients that can be controlled by the limited operator is: - Answer repeat exposure The limited operator can reduce repeat exposures by : - Answer clearly instructing the patients. How does the x -ray beam restriction minimize patient exposure - Answer It limits the radiation field to the area of interest. What is the de vice that allows the limited operator to vary the size of the radiation field? - Answer collimator How does filtration reduce patient exposure - Answer Removes longer -wavelength photons What is the National Council on Radiation Protection and Measurement s (NCRP) recommendation for the amount of total filtration? - Answer 2.5 mm Al equiv What are the three principal methods used to protect limited operators from unnecessary radiation exposure? - Answer Time, Distance, and Shielding Which of the following is NOT a type of personnel radiation shielding? - Answer Shadow Personnel shielding must be worn in the rare occasion during which the limited operator may need to remain in the radiographic room during an exposure to assist the patient in maintaining the proper position. What is the source of the greatest radiation ha zard under this circumstance? - Answer scattered radiation from the patient What is the term for radiation that escapes from the x -ray tube housing? - Answer leakage radiation Why are limited operators prohibited from activities that result in direct exp osure to the primary x -ray beam? - Answer They are considered occupationally exposed individuals Distance, as a method used to limit operator exposure, means that? - Answer The operator should maximize the distance from the source during the exposure Shielding worn for personnel protection is designed to attenuate what source of exposure? - Answer Scatter radiation Which of the following is an acronym for a common type of personnel dosimeter - Answer TLD What is the recommended placement for a personnel dosimeter on the body of the limited operator? - Answer The badge should be worn in the region of the collar on the anterior surface of the body and outside the lead apron, if worn. What is the NCRP recommended annual effective dose limit for occupationa l exposure ? - Answer 5.0 rem (50 mSv) What is the NCRP recommended monthly effective (or equivalent) dose limit to the fetus for a pregnant worker? - Answer 0.05 rem (0.5mSv) Radiation monitoring of personnel is required when what percentage of the annu al occupational effective dose limit is likely to be received? - Answer 10% What is the SI radiation unit to express radiation intensity in air ? - Answer Coulomb/ kilogram (C/kg) The SI unit used to report occupational dose to radiation workers is the: - Answer mSv What is the SI radiation unit of absorbed dose? - Answer Gray According to the Bergonie - Tribondeau law, which of the following toes of cells are most radiosensitive? - Answer Embryonic tissue cells
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