If 16 mAs produce appropriate IR exposure at 72 inches SID, how much mAs is needed at 48 inches SID to maintain that amount of IR exposure?

Name: If 16 mAs produce appropriate IR exposure at 72 inches SID, how much mAs is needed at 48 inches SID to maintain that amount of IR exposure?
Brand: Quizplus
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Quizplus · Accepted Answer

The mAs needed is calculated using the inverse square law for radiographic exposure: (mAs1/mAs2) = (SID1^2/SID2^2). Solving for mAs2 gives (16 mAs / mAs2) = (72^2 / 48^2), which simplifies to mAs2 = 7 mAs.

If 16 MAs Produce Appropriate IR Exposure at 72 Inches