If 12 mAs produce appropriate film density at 36 inches SID,how much mAs is needed at 72 inches SID to maintain that amount of film density?

Name: If 12 mAs produce appropriate film density at 36 inches SID,how much mAs is needed at 72 inches SID to maintain that amount of film density?
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Question

Quizplus · Accepted Answer

If the SID is increased by a factor of 2 (doubled),the beam intensity will be one fourth (1/2²)of the original,requiring a 4× increase in mAs to maintain density.

If 12 MAs Produce Appropriate Film Density at 36 Inches