The application of radium within the uterine cavity is one of the most common treatments in the field of radium therapy. This method of treatment is employed in such uterine conditions as hemorrhage, malignant growths, fibroids, polyps, papillomas and endometritis. In practically all of these diseases, hemogeneous and diffuse irradiation is essential. In order to provide this homogeneous and diffuse irradiation, an applicator is necessary which is both flexible and adjustable. This type of irradiation may be provided by one or both of two methods: (1) by applying multiple-area applicators, evenly distributed throughout the uterine cavity, or (2) by using an applicator which can be moved about throughout the entire uterine cavity so that the structures are evenly irradiated. The applicators ordinarily used today do not provide these essential factors. The single tube intra-uterine radium applicators commonly used measure approximately 3 by 10 mm. Usually this tube is introduced into