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radiation therapy  the treatment of disease, usually cancer, by ionizing radiation in order to deliver an optimal dose of either particulate or electromagnetic radiation to a particular area of the body with minimal damage to normal tissues. The source of radiation may be outside the body of the patient (external beam irradiation) or it may be an isotope implanted or instilled into the body (internal radiation therapy or brachytherapy). Called also radiotherapy and irradiation.




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