A radiographer receives 400 mR/hr standing 1 foot from a C-arm fluoroscopy unit.What is the exposure rate if the radiographer moves to 3 feet?

Question

Quizplus · Accepted Answer

The exposure rate decreases as the distance from the source increases. The inverse-square law states that the intensity of radiation is inversely proportional to the square of the distance from the source. Therefore, if the radiographer moves to 3 feet, the exposure rate would be approximately 25 to 50 mR/hr (400 mR/hr divided by 9). Choices A and B overestimate the exposure rate while choice D underestimates it.

A Radiographer Receives 400 MR/hr Standing 1 Foot from a C-Arm