What is radiation therapy?

Kill cancer by Rads. Use of high energy x-ray typically ( protons, gamma rays etc to name a few other) to cause irreparable damage to a target tumor to destroy the tumor while causing minimal damage to surrounding organs and tissues.
High powered xrays. High powered x-ray beam is directed towards your cancer to kill it. The machines are quite sophisticated so that they deliver the beam to the tumor without destroying a lot of normal tissue.