A collective term for interstitial, intracavity, and surface radiotherapy. It uses small sealed or partly-sealed sources that may be placed on or near the body surface or within a natural body cavity or implanted directly into the tissues.

Synonyms: Intracavity Radiotherapy, Radioisotope Brachytherapy, Radiotherapy, Intracavity, Interstitial Radiotherapy, Radioisotope Plaque Therapy, Plaque Therapy, Radioisotope, Brachytherapy, Radioisotope, Radiotherapy, Implant, Brachytherapy, Implant Radiotherapy, Radiotherapy, Surface, Curietherapy, Surface Radiotherapy, Radiotherapy, Interstitial, Therapy, Radioisotope Plaque