If the intensity of the beam is 900 mR at a distance of 21 inches, what does the distance need to be for the intensity to measure 100 mR?

Question

Quizplus · Accepted Answer

The intensity of radiation follows the inverse square law, which states that intensity is inversely proportional to the square of the distance. If the intensity decreases from 900 mR to 100 mR, the distance must increase by a factor of 3 (since 900/100 = 9, and the square root of 9 is 3). Therefore, the new distance is 21 inches * 3 = 63 inches.

If the Intensity of the Beam Is 900 MR at a Distance