Physics and Chemistry of Radiation Absorption -- Molecular Mechanisms of DNA and Chromosome Damage and Repair -- Cell Survival Curves -- Radiosensitivity and Cell Age in the Mitotic Cycle -- Fractionated Radiation and the Dose-Rate Effect -- Oxygen Effect and Reoxygenation -- Linear Energy Transfer and Relative Biologic Effectiveness -- Acute Radiation Syndrome -- Radioprotectors -- Radiation Carcinogenesis -- Heritable Effects of Radiation -- Effects of Radiation on the Embryo and Fetus -- Radiation Cataractogenesis -- Radiologic Terrorism -- Molecular Imaging -- Doses and Risks in Diagnostic Radiology, Interventional Radiology and Cardiology, and Nuclear Medicine -- Radiation Protection -- Cancer Biology -- Dose-Response Relationships for Model Normal Tissues -- Clinical Response of Normal Tissues -- Model Tumor Systems -- Cell, Tissue, and Tumor Kinetics -- Time, Dose, and Fractionation in Radiotherapy -- Retreatment after Radiotherapy: The Possibilities and the Perils -- Alternative Radiation Modalities -- The Biology and Exploitation of Tumor Hypoxia -- Chemotherapeutic Agents from the Perspective of the Radiation Biologist -- Hyperthermia.