1. What is the inverse Square Law Formula? I2I2 I1I1 = (D 1 ) 2 (D 2 ) 2 Next hint

2. old intensity I 1 In the preceeding problem identify: old distance D 1 new intensity I 2 new distance D 2 I2I2 I1I1 = (D 1 ) 2 (D 2 ) 2 Next hint Problem 8: A radiograph produced at an SID of 90 cm results in an exposure of 270 mR. At what distance would the exposure be reduced to 30 mR? 30 ? 270 90

3. Formula Set up: I2I2 I1I1 = (D 1 ) 2 (D 2 ) 2 = X Next hint

4. Formula Set up: D2D2 = X Next hint I1I1 (D 1 ) 2 I2I2

5. The intensity was in the Problem 6. Back to problem 8 Therefore, the distance should Decreased from 270 mR to 30 mR increase