AST Surgical Technologist Practice Exam

What are the three factors for reducing ionizing radiation exposure?

1. Time, cooling, distance

2. Time, shielding, distance

3. Distance, filtration, exposure

4. Shielding, exposure, time

The correct answer is: Time, shielding, distance

The three factors for reducing ionizing radiation exposure are time, shielding, and distance, which are fundamental principles in radiation safety. Time refers to the duration of exposure to the radiation source; minimizing the time spent near the source reduces the overall dose received. This means that if surgical technologists and other healthcare professionals limit their time near the source of radiation, they can effectively lower their exposure. Shielding involves using materials that can absorb or block radiation. Common shielding materials include lead aprons for protecting areas of the body during X-ray procedures or other types of radiographic imaging. The effectiveness of shielding depends on the type of radiation and the thickness and density of the shielding material. Distance is the spatial separation from the radiation source. The intensity of radiation decreases significantly with increased distance from the source due to the inverse square law, which states that the intensity decreases proportionately to the square of the distance from the source. By maximizing distance, exposure can be greatly minimized. Collectively, these three factors help ensure that those working in environments where ionizing radiation is present can reduce their risk of harmful exposure.