Extensively rewritten and updated, this is the new text-of-choice for radiation oncology, advanced physics, and dosimetry programs. Designed to give a thorough, up-to-date approach to the subject of radiation therapy physics, it includes coverage of atomic structure, computerized planning, computer systems, treatment planning, production of X-rays, interactions of X- and gamma rays, radiation units, measurement of ionizing radiation, calibration of megavoltage beams, basic dosimetry of radiation fields, treatment planning by manual methods and computer, sources and treatment planning for implant therapy, radiation protection, and quality assurance.