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Radiation therapy or Radiotheraphy (radiotherapy) – the method of treatment of diseases which is widely used for elimination of cancer educations. The method consists in influence of the getting beam (gamma or gamma radiations, x-ray) on an affected area. Radiation is carried out by specialized devices from a certain distance. The direction of radoactive radiation by means of implantation of radioactive material in an integument in the form of needles, conductings and tablets is also possible.