What happens to the intensity of radiation when the source is moved further from an object?

When a radiation source is moved further away from an object, the intensity of the radiation decreases. This principle is based on the inverse square law, which states that the intensity of radiation is inversely proportional to the square of the distance from the source. As the distance from the source increases, the area over which the radiation spreads increases. Consequently, the same amount of radiation gets distributed over a larger area, leading to a decrease in intensity as perceived at the object.

This concept is crucial in radiography and other fields where radiation exposure needs to be controlled and managed. Understanding the relationship between distance and intensity helps operators ensure that radiation exposure remains within safe limits for both patients and staff. Thus, moving the source further away is a recognized method to reduce exposure levels effectively.