Information on the patterns of personnel and equipment support at various radiation oncology facilities are included in the Facilities Master List surveys conducted by the American College of Radiology. This paper summarizes the surveyed data on equipment and dosimetrist and technologist support obtained during 1975-1986. There is increasing use of linear accelerators, simulators, and treatment planning computers but the use of 60Co units has been progressively decreasing. There are inadequate but slowly improving numbers of dosimetrists and technologists when compared with the level recommended by the Blue Book.