An in-depth introduction to radiotherapy physics emphasizing the clinical aspects of the field. This second edition gradually and sequentially develops each of its topics in clear and concise language. It includes important mathematical analyses, yet is written so that these sections can be skipped, if desired, without compromising understanding. The book consists of seven parts covering basic physics (Parts I-II), equipment for radiotherapy (Part III), radiation dosimetry (Parts IV-V), radiation treatment planning (Part VI), and radiation safety and shielding (Part VII). An invaluable text for radiation oncologists, radiation therapists, and clinical physicists.