Multiple-choice questions (MCQs) are used by many examination boards as a way of testing a broad spectrum of knowledge in an easily administered and unbiased way. They form a critical part of the Royal College of Radiologists Fellowship examinations. In 2002, the structure of the FRCR examination changed, and in response to new EU laws, the Part 1 examination syllabus now comprises questions on the physics and legal regulations surrounding ionizing radiation. This book is the perfect revision tool for candidates sitting the FRCR Part 1 examination and will also prove useful for those who need to acquaint themselves with the new IRMER (Ionizing Radiation (Medical Exposure)) regulations such as radiologists, cardiologists and anyone using ionizing radiation in any form for medical purposes. The book provides 175 questions, in 7 individual examination papers of 25 questions, all with detailed explanatory model answers, checklists and some with diagrams to aid understanding.