Radiotherapy treats cancer by using high-energy rays to destroy the cancer cells, while doing as little harm as possible to normal cells.
Radiotherapy only treats the area of the body that the rays are aimed at. It is often given in combination with chemotherapy. This is called chemoradiation. Chemotherapy makes cancer cells more sensitive to radiotherapy.
Radiotherapy doesn’t make you radioactive. It’s perfectly safe for you to be with other people, including children, throughout your treatment.