As part of its series on "Radiation protection dosimetry", the Commission, DG XII, has published the proceedings of a workshop on "Quality control and radiation protection of the patient in diagnostics radiology and nuclear medicine". The workshop, co-organized by the Commission in the framework of its European radiation protection education and training programme, took place in Grado, Italy, on 29 September to 1 October 1993. The workshop addressed the following areas: - Overview of trends and evolution in the past decade; - Intercomparisons of dose reduction concepts, methods and practices; - Definition of procedures for optimization of radiation protection, concerning the clinical, equipment and organizational aspects as well as training; - Analysis of the relationship between cost, risk and benefit; - Perspectives of the transfer of know-how to the user. The proceedings present the results of the workshop in light of the above under the following sections: - Guidance; - European and multinational trends and activities; - Image quality; - Computer applications; - Quality control; - Radiation protection of the patient. An author index and a list of participants are also included.