I have spent the last 15 years providing moderate sedation to cardiac cath and interventional radiology patients. The doctors take the highest dose of radiation because of their position next to patient. Most common problems they experience are cataracts,and hand boney changes . As others have mentioned, dosimeter badges are provided- rarely do personnel get even close to max (I think it's 3000 gray) mine is usually 400/month. Some MD don't wear their badges. Other use all the protection. Shielding, time, and distance are key factors.