This study guide will be a reliable support and easy-to-use source of information for students in the fields of dosimetry, physics, radiation oncology, and therapy as they progress through the educational levels in preparation for board examinations. The theoretical and practical knowledge gained by students on previous courses or in clinical settings is reinforced by means of almost 1200 questions and accompanying detailed analytical answers. In order to cater for the needs of all students, the questions are arranged according to three levels of difficulty. The level 1 questions are mainly intended for those hoping to pass the Medical Dosimetrist Certification Board (MDCB) exam but will also be beneficial for Medical Physics candidates taking written exams and for Radiation Oncology residents. The level II questions are in general clinically related and will be relevant for any student, while the level III questions are advanced and are especially suitable for American Board of Radiology candidates or those taking equivalent exams elsewhere in the world. The study guide is broken down into different subject areas, with provision of multiple questions and answers on each subject. In addition, the mathematical and physics questions include brief explanations of how the student can solve each problem. At the end of the guide, three practice tests are included with the same number of questions as are found in the MDCB exam. These tests will help students to test their knowledge and improve their test-taking speed.