But the normal cells recover from the damages of radiation and function properly. Radiotherapy is mainly used to treat cancer patients. Some of the commonly used radioactive substances are Caesium-137, Cobalt-60, Iodine-131 and Phosphorous-32. Radiotherapy is used to:
Cure many different types of primary cancer. (Curative therapy)
Control the cancer from spreading to different parts of the body..
Relieve symptoms such as pain as it makes life more comfortable in case of advanced stages of cancer. (Palliative therapy)
Assist the main treatment by reducing the size of the cancer and making the treatment more effective or to prevent the recurrence of cancer. (Adjuvant therapy)