Mixed Direct and Inverse Square Law Problems 1. If I took a radiograph of a patient at 40 inches SID and the intensity was 100mR, what would the intensity of the x-ray be if the patient was moved to 72 inches SID? 2. A satisfactory radiograph is made is made using 25 mAs at 40 inches SID. How many mAs are needed to produce a similar radiograph at 48 inches SID? 3. A satisfactory radiograph is made using 30 mAs at 72 inches SID. How many mAs are needed to produce a similar radiograph at 84 inches SID? 4. The intensity of a radiograph taken at 80 inches SID was 24mR, what would the new intensity be if I moved to a distance of 30 inches SID? 5. A satisfactory radiograph is made using 12 mAs at 40 inches SID. How many mAs are needed to produce a similar radiograph at 72 inches SID?

Mixed Direct and Inverse Square Law Problems 1. If I took a radiograph of a patient at 40 inches SID and the intensity was 100mR, what would the intensity of the x-ray be if the patient was moved to 72 inches SID? 2. A satisfactory radiograph is made is made using 25 mAs at 40 inches SID. How many mAs are needed to produce a similar radiograph at 48 inches SID? 3. A satisfactory radiograph is made using 30 mAs at 72 inches SID. How many mAs are needed to produce a similar radiograph at 84 inches SID? 4. The intensity of a radiograph taken at 80 inches SID was 24mR, what would the new intensity be if I moved to a distance of 30 inches SID? 5. A satisfactory radiograph is made using 12 mAs at 40 inches SID. How many mAs are needed to produce a similar radiograph at 72 inches SID?