Easy-to-read and engaging, this text offers a succinct overview of radiation biology and protection concepts. It teaches both why and how to protect yourself and patients from ionizing radiation. Emphasis is placed on integrating the theory of radiation protection as seen in radiobiology with radiation protection as it should be practiced in the clinical education setting. The text discusses cell structure, the direct and indirect effects of radiation at the cellular level, biological effects of radiation exposure, and protection practices for both patients and personnel. Current regulations and recommendations are in compliance with the educational requirements established by the American Society of Radiologic Technologists (ASRT).