31. A satisfactory radiograph is produced as follows: Single phase-2 pulse, 80kVp, 25 mAs, 72inch SID, 12:1 grid, 200 RSV. A new radiograph is to be produced with the following changes: 3-Phase-12 pulse, 68kVp, 8:1 grid, and 400 RSV. What changes should be made to maintain the original density?
