CAMRT Radiography Practice Exam

According to radiation protection guidelines, what is a key method for reducing exposure to radiation?

1. Using higher doses

2. Increasing proximity

3. Decreasing shielding

4. Increasing distance

The correct answer is: Increasing distance

Increasing distance is a key method for reducing exposure to radiation because of the inverse square law, which states that the intensity of radiation is inversely proportional to the square of the distance from the source. This means that as you move further away from the radiation source, the amount of exposure you receive decreases significantly. By doubling the distance from the source, for example, you reduce the radiation exposure to one-fourth of its original value. This principle is foundational in radiation protection practices, as it encourages individuals to maintain as much distance as possible from sources of radiation, thereby minimizing their exposure. The other methods presented do not contribute to reducing radiation exposure effectively. Using higher doses would result in increased exposure, while increasing proximity to the radiation source would lead to greater exposure risks. Decreasing shielding, which is meant to block or reduce radiation intensity, would similarly increase risk rather than mitigate exposure.