Preface This book is intended as a textbook for a course in radiation physics in aca-demic medical physics graduate programs. The book may also be of interestto the large number of professionals, not only physicists, who in their dailyoccupations deal with various aspects of medical physics and have a need toimprove their understanding of radiation physics is a rapidly growing specialty of physics, concerned withthe application of physics to medicine mainly, but not exclusively, in the ap-plication of ionizing radiation to diagnosis and treatment of human disease.