Radiology All are true about Modern Xray tube except? A It has a rotatory Cathode. B Heat loss is mainly By Radiation. C Rhenium is added to tungsten target at Anode. D Chief source of Xray generation is by Bremstrahlung effect. 💡 Explanation All are true about Modern Xray tube except? ✓ Correct Answer: A. It has a rotatory Cathode.