Radiology For normal mammography, X-ray tube with a nominal focal size of-mm is used? A 0.2-0.25 B 0.3-0.35 C 0.4-0.45 D 0.45-0.50 💡 Explanation For normal mammography, X-ray tube with a nominal focal size of-mm is used? ✓ Correct Answer: B. 0.3-0.35