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This is the thirteenth report of the Medical Research Council describing the research done with radium and radon distributed by the Medical Research Council to selected centers in Great Britain and Ireland. The original stock of radium entrusted to the council by the British government and lent by the council to various centers is supplemented by further quantities provided by the British Empire Cancer Campaign and by the National Radium Commission. The research, which has been continued for several years at the Strangeways Laboratory, Cambridge, tends to show that biologic effects produced by radiation can be repeated over and over again with a measure of accuracy not always attained in purely physical fields, provided the most rigorous attempt is made to limit the number of variables operating at one and the same time. They find that to get a well recognized effect there is an optimum intensity at which the
Medical Uses of Radium. Summary of Reports from Research Centres for 1934. JAMA. 1936;106(12):1032–1033. doi:10.1001/jama.1936.02770120064028