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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)
The radiation oncologist (a doctor specially trained to treat cancer with radiation) selects the type of radiation thatâs most suitable for each patientâs cancer type and location. Photon radiation 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).xternal beam radiation External beam radiation is the most widely used type of radiation therapy, and it most often uses photon beams. The radiation comes from a machine outside the body and is focused on the cancer. Itâs a lot like getting an x-ray, but for longer.