CAMRT Radiography Practice Exam

What is the single most effective means of radiation protection for the radiographer performing mobile procedures?

1. Time

2. Distance

3. Shielding

4. Workplace Design

The correct answer is: Distance

The most effective means of radiation protection for the radiographer performing mobile procedures is distance. Increasing the distance from the radiation source reduces exposure according to the inverse square law, which states that as you double the distance from the source of radiation, the exposure is reduced to one-fourth. This principle makes distance a powerful method for minimizing radiation dose, particularly in a mobile setting where the radiographer may have to maneuver around patients and equipment. Although time, shielding, and workplace design are also important considerations in radiation safety, they may not provide the same level of effectiveness as increasing distance. Time refers to minimizing the duration of exposure, while shielding involves using protective barriers to absorb radiation. Workplace design can promote safety through thoughtful layout and protocols but is less directly impactful compared to the physics of distance. Thus, maintaining a greater distance is the optimal strategy for mobile procedures where controlling exposure is critical.