Radiation Risk: Average US background radiation in one year: 3 mSv CxR: 0.02 mSv Pelvis XR: 0.7 mSv CT Head: 2mSv CT Chest: 8mSv CT A/P: 10mSv Cardiac PET: 14mSv So what is the risk for cancer? It varies by study type, age, and sex. So for example, if a 20 yo F gets a …