What is the safe distance rule when working near radioactive sources?

The safe distance rule in radiation protection is fundamentally based on the principle that increasing distance from a radioactive source decreases exposure to radiation. This principle is grounded in the inverse square law, which states that the intensity of radiation exposure diminishes with the square of the distance from the source. As you double the distance from the radioactive source, the radiation intensity—and therefore the exposure—reduces to a quarter of what it was at the original distance.

This is critical for ensuring safety when working near radioactive materials. By maintaining a greater distance, individuals can significantly lower their risk of receiving a harmful dose of radiation. The importance of understanding this principle cannot be overstated, as it plays a crucial role in practical radiation safety protocols in various environments, including medical, industrial, and research settings.

Other choices may imply misconceptions about how distance affects radiation exposure, leading to inadequate safety practices. Therefore, mastering the concept of distance as a protective measure is essential for anyone working in environments where radioactive sources are present.