Chapter 1: Introduction.- Chapter 2: Science Discovers, Medicine Applies, Protection Lags, 1896-1902.- Chapter 3: X-ray Protection Advances, Radium Protection Lags, 1902-13.- Chapter 4: War Enlarges and Enriches Medical Radiology, 1912-18.- Chapter 5: X-ray Measurements and Radium Protection Catch Up, 1914-22.- Chapter 6: Establishment of International Norms, 1922-40.- Chapter 7: War Generates Radioactive and Political Fallout, 1939-1965.- Chapter 8: Tightening Norms Again and Opening to the Public, 1965-2023.- Chapter 9: What Radiation Protection Suggests About Other Issues, 1990-present.