Following the publication in 1960 of the Second Report of the Committee on Radiological Hazards to Patients*radiologists have faced a great increase in their responsibility for matters of radiation protection. The Committee concluded, from its survey of British radiological practice and the estimation of radiation dose of genetic significance, that no need existed for major restrictions in the medical application of ionising radiation. It was nevertheless, stressed that the general adoption of the Committee's recommendations would substantially reduce the total genetic dose to the population without detriment to the patient.