Radiotherapy

The use of X rays as a treatment is known as radiation therapy and is largely used for the management (including palliation) of cancer; it requires higher radiation energies than for imaging alone. X radiation (composed of X rays) is a form of electromagnetic radiation. Most X rays have a wavelength in the range of 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3?1016 Hz to 3?1019 Hz) and energies in the range 100 eV to 100 keV. X ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. In many languages, X radiation is referred to with terms meaning R