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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)
A high-energy photon beam is by far the most common form of radiation used for cancer treatment. It is the same type of radiation that is used in x-ray machines, and comes from a radioactive source such as cobalt, cesium, or a machine called a linear accelerator (linac, for short). neutron is a particle in many atoms that has no charge. Neutron beam radiation can sometimes help when other forms of radiation therapy donât work. Few facilities in the United States offer it, and use has declined partly because it can be difficult to target the beams effectively.