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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. 1  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.