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Electron Beam Therapy Most patients are treated with x-ray beams produced by linear accelerators. These accelerators can also produce a beam of high energy electrons which penetrate into tissue to a much more limited depth than x-rays. The biological effect of electrons and x-rays is identical. Electron beams can be used for treating superficial tissues such as skin, lymph nodes and whenever it is preferable to deliver a higher radiation dose superficially and relatively less dose to deeper tissues.
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