Effect of High-Dose-Rate 192Ir Source Activity on Late Rectal Bleeding After Intracavitary Radiation Therapy for Uterine Cervix Cancer

This is the first clinical report concerning the source activity effect of HDR 192Ir on late rectal bleeding in patients undergoing HDR-ICRT. This suggests that when source activity is higher than 2.4 cGy.m2.h−1, ICRT should be performed with more caution not to exceed 100 Gy3 in total.