Brachytherapy, or internal radiation, places the source of high-energy rays as close as possible to the cancer site. This particular radiation therapy includes:

• Implants of radioactive materials sealed in wires, seeds, capsules or needles
• Use of both high dose and low dose brachytherapy sources
• Intercavitary internal therapy which involves placing the radiation sources within a cavity of the body such as the lung or esophagus
• Interstitial therapy in which the radioactive source including seeds of palladium or iodine are implanted directly into the tumor-bearing tissue