Following publication of this Report in 1960, measures to implement the numerous technical recommendations therein contained have undoubtedly produced a considerable reduction in patient dosage in diagnostic radiology, with especial reference to dosage of genetic significance for the population as a whole. To maintain the success achieved will require constant vigilance on the part of the radiologist, assisted by the radiation protection services and the hospital physicist. There is an increasing need for closer liaison between the latter and the diagnostic department if there is to be effective, continued control of diagnostic installations and techniques, especially those involving prolonged exposure such as cardiac catheterisation and cineradiography.In the very wide variety of departments providing diagnostic services, ranging from the large, fully staffed teaching hospital unit to the small hospital department served by a single-handed, possibly part-time, radiographer and a visiting radiologist, it is probable that much remains to be done. In particular it is necessary to inculcate a wider appreciation of problems of radiation protection and progressively higher standards of technical ability amongst radiographic staff. Greater precision in radiographic techniques must contribute to a reduction in patient dosage; in this respect the introduction of controlled, automatic processing and of units incorporating automatic radiographic exposure control, intelligently used, will be of great assistance.