Since its initial publication in 1979, Essential Physics for Radiographers has earned an international reputation as a clear and straightforward introduction to the physics of radiography, and remains the core textbook for student radiographers. This third edition reflects the change from diploma to graduated radiography education. Nonetheless, the authors have retained the pragmatic approach of earlier editions and continue to provide a text for those students who find it difficult to grasp the subject of physics. The book has undergone major revisions and the content has been broadened to reflect the recent advances in imaging technology. New topics include magnetic resonance, lasers and alternating current theory. Fundamental physical concepts such as internal energy and post–Bohr atomic theory are more fully discussed in order to stimulate students to find out more information. Terminology has been revised to bring it in line with current educational and scientific practice, and decimal numbering of sections has been introduced. Information sources have been referenced and an extensive bibliography is provided. New diagrams are included, others have been redrawn with greater accuracy, and tables of physical data have been included. Worked examples and calculations feature strongly, and the innovative context–sensitive Maths Help File guides readers gently through the mathematical steps and concepts.