摘要: The 20th L H Gray Conference held in 2002 took as its general title ‘‘Radiation Cancer Analysis and Low Dose Risk Estimation’’. purpose of the meeting was to bring together experts from a broad spectrum disciplines, including epidemiologists, modellers, statisticians radiation biologists discuss new insights radiation-induced carcinogenesis implications for low dose risk. findings are also especially timely large number staff healthcare professions who concerned with diagnostic uses ionizing radiation. Ionising Radiation (Medical Exposure) Regulations 2000 [1] extensive Guidance Notes these regulations recently published [2] rely heavily on linear-no-threshold (LNT) model induced cancer, regard principles Justification Optimization. Therefore it is important be aware latest findings, both against model, degree confidence that can attached it. A major aim look at extent which multistage cancer models bridge gap between mechanistic information such vitro responses epidemiological risks estimated an LNT approach. Four areas research provided majority papers; 1) modelling, 2) basic mechanisms bystander effects, 3) radon exposure lung risks, 4) after radiotherapy.