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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)
Ionizing radiation is energy that is carried by subatomic particles and photons capable of causing atoms to lose electrons and become ions. For example, this radiation is given off by the radioactive decay of unstable atoms, X-ray machines, particle accelerators, and nuclear reactions such as fission.