Radiation Safety Practice Exam

Which of the following is NOT a method to reduce radiation exposure?

1. Time

2. Distance

3. Increased radiation levels

4. Shielding

The correct answer is: Increased radiation levels

To reduce radiation exposure effectively, the principles of time, distance, and shielding are commonly applied. Time refers to the duration of exposure to radiation; minimizing time reduces the total dose received. The longer one is near a radiation source, the greater the exposure, hence limiting time spent in the vicinity of radiation sources mitigates risk. Distance is a critical factor because radiation intensity decreases with increasing distance from the source. This is based on the inverse square law, which states that doubling the distance from a radiation source reduces the exposure to a quarter of its intensity. Therefore, maintaining or increasing distance from radiation sources significantly aids in reducing exposure. Shielding involves using materials to absorb or block radiation, thus protecting individuals from exposure. Dense materials such as lead, concrete, or thick plastic can be effective shields against different types of radiation, depending on their energy levels and nature. In contrast, increased radiation levels represent a situation that would elevate exposure rather than mitigate it. Therefore, this choice distinguishes itself as NOT a method used to reduce radiation exposure since it inherently increases risk rather than providing protective benefit.