How does radiation intensity change with increasing distance from the source?

The correct response is supported by the inverse square law of radiation, which states that the intensity of radiation from a point source is inversely proportional to the square of the distance from that source. This means that as you move away from the radiation source, the intensity diminishes rapidly; specifically, if you double the distance from the source, the intensity will decrease to one-fourth of its original value.

This principle is vital in radiographic testing, as it informs technicians about how to manage exposure risks while ensuring sufficient imaging quality. Understanding this relationship allows radiographers to calculate appropriate safe distances and maintain optimal exposure levels when performing tests. Other options do not accurately express the relationship between radiation intensity and distance.