If the intensity of radiation at 36 inches is 480 mR, what is the intensity if the SID is increased to 72 inches?

Question

Quizplus · Accepted Answer

The intensity of radiation follows the inverse square law, which states that the intensity is inversely proportional to the square of the distance. When the distance is doubled (from 36 inches to 72 inches), the intensity is reduced by a factor of 4 (since 2^2 = 4). Therefore, 480 mR divided by 4 equals 120 mR.

If the Intensity of Radiation at 36 Inches Is 480