What is the Agent or device used in radiation therapy for tumor?

In radiation therapy, the primary agent used to target tumors is ionizing radiation, which can be delivered through various devices like linear accelerators (LINACs) or brachytherapy sources. These devices emit high-energy particles or waves, such as X-rays or gamma rays, which damage the DNA of cancer cells, ultimately leading to tumor shrinkage or destruction. The choice of agent and delivery method depends on the type, location, and stage of the tumor being treated.