Radiation Protection and Safety Flashcards

Which type of radiation interaction is primarily responsible for occupational radiation exposure during diagnostic radiography?

Answer: Compton scattering

Compton scattering is the primary source of scatter radiation that creates occupational exposure in diagnostic radiography, as it produces scattered photons that travel in all directions.

The maximum permissible dose (MPD) for the lens of the eye for occupationally exposed workers is:

Answer: 150 mSv/year (15 rem/year)

The annual dose limit for the lens of the eye for radiation workers is 150 mSv (15 rem) per year per NCRP guidelines.

Which radiation exposure response model assumes that any amount of radiation, no matter how small, carries some risk of harm?

Answer: Linear no-threshold (LNT) model

The linear no-threshold (LNT) model assumes a linear relationship between dose and risk with no safe threshold, meaning any radiation exposure carries some level of risk.

When performing mobile radiography in a patient's room, the radiographer should stand at least how far from the x-ray tube during exposure?

Answer: 6 feet (1.8 m) away and at a 90° angle to the primary beam

During mobile radiography, the radiographer should stand at least 6 feet (1.8 m) from the x-ray tube and at a 90° angle to the primary beam to minimize scatter radiation exposure.

Stochastic effects of radiation, such as cancer induction, are characterized by:

Answer: Having no threshold dose and increasing in probability with increasing dose

Stochastic effects have no threshold; the probability of occurrence increases with dose, but the severity does not depend on dose.

Which protective measure is most effective in reducing patient dose during pediatric radiography?

Answer: Tight collimation to the area of clinical interest

Tight collimation limits the x-ray beam to only the area of interest, directly reducing the volume of tissue irradiated and thus the patient dose.