If 10 mAs produce appropriate IR exposure at 40 inches SID, how much mAs is needed at 48 inches SID to maintain that amount of IR exposure?

Name: If 10 mAs produce appropriate IR exposure at 40 inches SID, how much mAs is needed at 48 inches SID to maintain that amount of IR exposure?
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Question

Quizplus · Accepted Answer

The mAs must be adjusted according to the inverse square law. The formula is (mAs1/mAs2) = (SID1^2/SID2^2). Plugging in the values: (10/mAs2) = (40^2/48^2), solving gives mAs2 = 14 mAs.

If 10 MAs Produce Appropriate IR Exposure at 40 Inches