[en] An account is given of the activities of the ICRU since 1973, and six studies completed during the period are summarised. Three of these have already been published as ICRU reports and three are in process of publication. The report describes the Commission's organization, fields of interest, current and future programs, relationships with other organizations, awards, finances and membership. A list of ICRU reports and the number of copies of each distributed during the period January 1927 to August 1977 is included. (author)