How does distance from a point source affect radiation exposure?

As the distance from a point source of radiation increases, the exposure to that radiation decreases according to the inverse square law. This law states that the intensity of radiation from a point source is inversely proportional to the square of the distance from the source. In practical terms, if you double the distance from the radiation source, the exposure will be reduced to one-fourth (1/2^2) of the original level. This principle applies because as the distance increases, the same amount of radiation spreads over a larger area, leading to lower intensity per unit area and consequently lower exposure for any individual at that distance.

Understanding this concept is crucial for safety in environments where radiation is present, as it highlights the importance of maintaining sufficient distance from radiation sources to minimize exposure and potential health risks.