Which of the following is a key factor in reducing radiation exposure?

Increasing distance from the source of radiation is a key factor in reducing exposure because radiation intensity decreases significantly with distance. This is known as the inverse square law, which states that the intensity of radiation is inversely proportional to the square of the distance from the source. By moving further away from a radiation source, you can reduce your exposure to harmful levels of radiation, making it a fundamental practice in radiation safety protocols.

In contrast, while wearing thicker clothing can provide some protection against certain types of radiation, it is not as effective or reliable a strategy as increasing distance. Minimizing air circulation does not effectively reduce radiation exposure and might even pose other safety concerns, especially in situations involving airborne contaminants. Using lower doses of medication does not relate directly to radiation exposure and is more about the appropriate medical administration of drugs rather than radiation safety. Thus, the practice of increasing distance remains the most effective and universally applicable method for minimizing radiation exposure.