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  • Systems designed to deliver high-energy ionizing radiation, including photon radiation (e.g., x-rays, gamma rays) and particle radiation (e.g., electrons, neutrons). Most systems are designed for external radiation therapy (teletherapy) using high-energy machines that radiate gamma rays, electrons, or x-rays (e.g., linear accelerators, cobalt units); these systems typically include control units and may also include radiation-delivery devices. The intensity of the beam of radiation, expressed in kilo- or megavolts, determines both the depth of penetration into the body tissues and the energy of the electrons produced by secondary ionization within the tissues. Radiotherapy systems are used in the treatment of malignant neoplasms and occasionally in the treatment of certain benign conditions.
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