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Radiation Protection Principles Flashcards

7 cards from real ARRT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Radiation Protection Principles flashcards as text

  1. During a portable chest X-ray, the technologist should stand at least how far from the patient if no protective barrier is available?

    Answer: 6 feet (2 meters)

    Standing at least 6 feet (2 meters) from the patient and outside the primary beam significantly reduces scatter exposure during portable radiography.

  2. What type of radiation exposure effect describes cataracts developing after high-dose exposure to the eye?

    Answer: Deterministic (nonstochastic) effect

    Cataracts are a deterministic effect with a dose threshold; severity increases with dose above the threshold.

  3. Which of the following best defines the concept of 'workload' (W) in shielding calculations for a radiographic room?

    Answer: Weekly total of mA-minutes at a reference kVp

    Workload (W) is expressed in mA-min per week and represents the total amount of radiation produced, used in NCRP shielding design calculations.

  4. A technologist's monthly dosimeter reading shows 5 mSv. Which action is most appropriate?

    Answer: Investigate work practices and potential sources of elevated exposure

    5 mSv in one month is elevated (10% of the annual limit) and warrants investigation of work practices, even though it is not a regulatory violation.

  5. Which interaction between X-ray photons and matter is the primary source of occupational scatter radiation in diagnostic imaging?

    Answer: Compton scatter

    Compton scatter is the dominant interaction at diagnostic energies (above ~30 keV) and is the main source of scatter radiation reaching the technologist.

  6. The use of gonadal shielding is indicated when the gonads are within how many centimeters of the primary beam edge?

    Answer: 5 cm

    Gonadal shielding should be used when the gonads are within 5 cm of the primary beam to protect these radiosensitive reproductive organs.

  7. Which of the following correctly describes the use factor (U) in radiation shielding design?

    Answer: Fraction of time the primary beam is directed at a particular barrier

    The use factor (U) represents the fraction of time the primary beam is directed toward a specific wall, floor, or ceiling during normal operations.