Why is distance considered a cardinal principle in radiation protection?

Distance is a fundamental principle in radiation protection because it effectively reduces the intensity of radiation exposure. As the distance from a radiation source increases, the intensity of the radiation decreases significantly due to the inverse-square law. This law states that the intensity of radiation is inversely proportional to the square of the distance from the source. Therefore, by maintaining or increasing distance, the risk of exposure to harmful radiation can be minimized, leading to better safety for both healthcare workers and patients.

While other aspects like access to patients, time management in radiology, and visibility in imaging play roles in radiological practices, they do not directly relate to the physics of radiation exposure as the concept of distance does. The primary concern in radiation protection is minimizing exposure to harmful radiation, making distance a critical component.