Irradiation. Definition

Medical Definition: Irradiation

Using high-energy radiation from x-rays, gamma rays, neutrons, protons and other sources to kill cancer cells and shrink tumors. Radiation may come from a machine outside the body (external beam radiation) or from radioactive material placed in the body near cancer cells (internal radiation therapy). Systemic irradiation uses a radioactive substance, such as a radiolabeled monoclonal antibody, that circulates in the blood to tissues throughout the body. Also called radiotherapy and radiotherapy.

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