Radiation therapy is a type of cancer treatment that uses beams of penetrating energy to kill cancer cells. Radiation therapy usually uses X-rays, but protons or other types of energy can also be used.

The term "radiation therapy" most often mentions to external beam radiation therapy. During this type of radiation, the high-energy rays come from a machine outside your body that directs the rays to a precise point on your body. Throughout a different type of radiation treatment called brachytherapy (brak-e-THER-uh-pee), radiation is placed inside your body.

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