Cancer: Your Guide to Radiotherapy Download English PDF, 12.6MB, PDF Download Chinese PDF, 17.2MB, PDF What is Radiation Therapy?Radiation therapy is the use of precisely calculated doses of high-energy X-rays to treat part(s) of the body where there is disease. It is generally pain-free. One course of radiation treatment can involve single or multiple sessions depending on the radiation oncologist’s instruction. Most patients receive their treatment as an outpatient at the Radiotherapy Centre.You can find out more about Radiotherapy in the booklet below. [Please download the PDF file if you are unable to view the image below.]