Radiation therapy or radiotherapy is one of the most important branches of medical physics. Radiotherapy to the treatment of disease by the use of beams of penetrating, like X-rays, alpha, beta, and gamma, that's either machine-spun or are of medicines containing materials emitted are say .

the primary use of radiation therapy in the treatment of, or reducible diseases, and cancer.

nearly two-thirds of cancer patients in the stream treatment of the radiation therapy they use. In 2004, the number in the U.S. to 1 million. In the meantime, cancer, prostate, cancer, lung and breast cancer by 56% problems make.