This concise volume provides essential advice and guidelines for all those medical personnel involved in the administration of radiation for diagnostic or therapeutic purposes. Legislation has been introduced in Europe and the UK to reduce patient radiation doses. In the UK, the Ionising Radiation (Protection of Patients Undergoing Medical Examination or Treatment) Regulations, known colloquially as the POPUMET Regulations, require medical personnel to have received essential training in radiation protection. This volume covers the background material required by those taking approved training courses and summarizes the core of knowledge that forms the basis of the POPUMET regulations.