Radioactive metals can be put inside the body to give a dose of radiation to the cancer. This is called brachytherapy. Some types stay in the body for a very short time and some are permanent.
Find out how radioactive metal gives radiotherapy from inside the body to treat some types of cancer.
This type of internal radiotherapy treatment uses radioactive wires, tubes and needles. It is used for a number of different types of cancer.
Selective internal radiation therapy (SIRT) is a way of giving radiotherapy treatment for cancer in the liver.