This book discusses both regulatory and professional aspects of radiation protection, covering medical imaging and radiation oncology. The book includes substantial information on international aspects of radiation protection, through the active participation of the six IOMP regional organizations and 60 IRPA countries. Relevant recommendations from the International Atomic Energy Agency (IAEA) are incorporated. Information covered includes radiation exposure from imaging and radiotherapy procedures, and their interpretation in terms of safety and radiation risks to patients and members of medical staff.