The European Commission has published technical descriptions of the projects in radiation protection research carried out under the nuclear fission safety (NFS) programme during 1990-1992. The publication is intended to disseminate administrative information about the research groups and to identify the scientific basis and scope of the contracts. The information provided is twofold: first, all administrative data such as names and addresses of contractors as well as the duration and budget of the contract; second, the scientific background and expected developments as well as their possible application in this specific area. This broad, multidisciplinary research activity is divided into three main themes: - Human exposure to radiation and radioactivity (measurement of radiation dose and radioecology); - Consequences of radiation exposure to man (stochastic and non-stochastic effects and effects on the developing organism); - Risk and management of radiation exposure (assessment of risk and optimization of radiation protection). Under these general headings are grouped: the management policies for the optimization of radiological work; exposure of patients and members of the medical profession during diagnostic radiology; behaviour or radionuclides in the environment; the study of the mechanisms of radiation carcinogenesis; the problems of natural radioactivity (including its concentration due to human activities) as well as the means of achieving optimal management and communication on the risks associated with radiation and radioactivity. Descriptions are also provided of the experimental collaborative projects and the joint study projects which have been established under the Agreement between the European Commission and the three republics Belarus, Ukraine and the Russian Federation to carry out cooperative work on the consequences of the Chernobyl reactor accident.