What are the "Cardinal Principles of Radiation Protection" that have the greatest effect?

The "Cardinal Principles of Radiation Protection" are essential concepts designed to minimize radiation exposure to individuals, particularly in medical and industrial settings. The correct principles are time, distance, and shielding.

Time refers to reducing the amount of time spent near a radiation source, as exposure increases with additional time spent in proximity. Distance involves increasing the distance from the radiation source because the intensity of radiation diminishes significantly with increased distance. Shielding consists of using barriers made of materials that can absorb or deflect radiation, effectively reducing exposure to those within the vicinity of the radiation source.

By applying all three principles—minimizing time, maximizing distance, and incorporating adequate shielding—radiation exposure can be significantly reduced, ensuring safety for workers and patients alike. This combination is crucial in safe radiation practices, especially in environments where radiation is prevalent.