A Technologist Is Sitting near a Bone Mineral Densitometer, Which

A technologist is sitting near a bone mineral densitometer, which is a point source of x-rays.If the x-ray intensity at 1 m from the x-ray beam is 0.20 mR/hr, to what distance from the x-ray beam should the technologist move to decrease total weekly exposure to the occupational limit of 2 mR for a 40-hour workweek?

A) 0.5 m
B) 1.5 m
C) 2.0 m
D) 2.5 m