Radiation therapy is a treatment that uses high energy rays to kill cancer cells or shrink tumors. Learn about radiation therapy for prostate cancer here..WebMD explains the use of radiation therapy for prostate cancer, including internal and external radiation therapy, how radiation therapy is performed, side effects, risks, and more..If you have localized prostate cancer that needs curative treatment, you have two good options Radiation and surgery. You can read more about surgery here. More than , American men opt for radiation every year, and the cure rates are excellent. It doesn t require anesthesia, and this makes it an especially good .Prostate cancer radiation therapy can cause many side effects, but in some cases it might be a good option. These FAQ on Radiation Therapy can be of help..