[en] Developments in radiation protection systems which have occurred within the CEA are described. Such systems enable irradiation and contamination risks to be quantitatively determined and monitored. A monitoring station is defined to be a suitable radiation detector (with its associated electronics) and audible and visible means of alerting personnel. The outputs from all the monitoring stations are fed to a central control station where they are recorded and acted upon. The practical experience obtained using microprocessors on the monitoring stations and a minicomputer in the central station is discussed; 30 units are connected to the central minicomputer in order to control an effluent treatment plant. (U.K.)