Indicated for an operator to apply, by remote control, a radioactive source in the body through an interstitial, intracavitary, intraluminal, bronchial, endovascular, intraoperative applicator, radiation therapy for the treatment of cancer. Transplant applicators and tubes, an integral part of the brachytherapy system, are used to apply the radiation directly to the patient at the specific sites selected by the physician and are the only part of the system that has contact with the patient.