JUAN A. DEL REGATO, Radiologicalphysicists, New York, American Institute ofPhysics for the American Association of Physicists in Medicine, 1985, 4to, pp. v, 188, illus., $25.00. Radiology provided perhaps the main route by which physicists entered medicine in the period leading up the Second World War. Among other things, they were needed to develop and service X-ray and radium equipment; to de...