Foundational Radiobiology and Safety era
Louis Harold Gray, a British radiobiologist whose work in the postwar era refined dose–response concepts and established quantitative dosimetry through absorbed-dose measurements that became the backbone of experimental radiobiology and early radiotherapy planning. Rolf Maximilian Sievert, a Swedish physicist and pioneering radiation protection advocate, helped formalize protection quantities such as equivalent and effective dose and guided practical safety standards and exposure limits during this period. Saul Hertz, an American radiologist, translated radiopharmaceutical chemistry into clinical practice by demonstrating the diagnostic and therapeutic use of cyclotron-produced isotopes in thyroid imaging and related therapies. Collectively these figures contributed to biokinetic modeling, standardized dosimetry, and procedural uniformity that institutionalized measurement practices and protective norms essential for later imaging and therapy advances.
Imaging Fidelity and Safety era
Godfrey Hounsfield's development of the CT scanner in the 1970s established quantitative imaging fidelity and reframed dose considerations in clinical practice. Allan Cormack provided the essential mathematical groundwork for CT reconstruction in the 1960s–70s, enabling faithful image formation and assessment of resolution. Franz M. Attix's authoritative texts on radiological physics and dosimetry defined objective detection limits and dose-estimation standards guiding safety regulation. John Bushong helped translate imaging physics into practice through radiologic science education, codifying concepts of image quality and dose optimization for technologists.