If a technologist stands 2 m from an X-ray tube and receives an exposure rate of 4 mR/h,the exposure rate would be _____ mR/h if the person stands 4 m from the X-ray tube.

Question

Quizplus · Accepted Answer

The exposure rate decreases by the square of the distance from the source, according to the inverse square law. Doubling the distance from 2m to 4m decreases the exposure by a factor of 4 (2^2), so 4 mR/h divided by 4 equals 1 mR/h.

If a Technologist Stands 2 M from an X-Ray Tube