Square law

The inverse-square law, or square law for short, states that a specified physical quantity is inversely proportional to the square of the distance from the source of that physical quantity. The fundamental cause for this can be understood as geometric dilution corresponding to point-source radiation into three-dimensional space.

Related quantities

• attenuation coefficient
• buildup factor
• dose conversion coefficient
• half-value thickness
• kerma-rate constant
• radiotoxicity equivalent
• transmission