These include cancers of solid tissues such as the lung , breast , and gastrointestinal tract, and melanoma , which is a skin cancer. The decision to use radiation therapy, and how to use it, depends on a number of factors. Among them are the tissue type, the location and stage of the cancer, the symptoms, and whether the intent is cure or symptom improvement. Implants can be placed anywhere inside the body. Implants may use wires or rods that are placed at the site of the tumor.
Implants involve radioactive cesium, radium, or iridium.
The implants can remain in place for several hours to several days. They are removed after the dose of radiation has been delivered. These pellets do not hurt and are not generally able to be felt once they are in the body. Electron beams are low energy. They are often used for skin or other surface problems.