Geraldine O’Reilly is the Chief Physicist and Head of the Medical Physics and Bioengineering Department (MPBE) in St. James’s Hospital, Dublin. Geraldine is the Radiation Protection Adviser to the Hospital and is a registered Medical Physics Expert. In addition to her hospital role, Geraldine has been actively involved in the development of radiation safety legislation and standards for over 20 years, working with a number of national and international groups. She is a member of the Article 31 Group of Experts which advises the European Commission on matters relating to radiation safety and chairs the sub-committee to that group which looks specifically at medical exposures. She lectures on a number of undergraduate and post graduate academic programmes.