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Radiation therapy uses high-energy radiation to shrink tumors and kill cancer cells. -X-rays, -gamma rays, -charged particles. are types of radiation used for cancer treatment. The radiation may be delivered by. 1. a machine outside the body (external-beam radiation therapy)
External radiation, sometimes called external beam radiation, is the most common type of radiation. In this technique, a large machine called a linear accelerator aims a beam of high-energy radiation at the area affected by the cancer. This form of radiation is given on an outpatient basis 5 days a week, over 5 to 7 weeks, depending on the particular situation.