Hello, Hope you are in good health now.
Your concern about radiation exposure is valid, but as per available data not much can be predicted about it's ill effects. Sometimes a fracture pt goes through multiple radiographs in a single day. Radiation exposure effects also depends on a variety of other factors too.
Here, the more concerning thing is The Contrast. A substance drunk(in CECT) or Injected (in CTA) into the patient. It can be dangerous if your
kidney are injured, they'll fail to excrete it. And/or if one is sensitive/allergic to it. but i hope the hospital assesed your fitness before the procedure.
Thanks
Stay healthy.
Consult if any other queries.