This therapy uses radioactive substances known as radioisotopes or radionuclides. Radioisotopes are given by mouth as a drink or capsules, or injected into a vein (intravenous injection). Cancer cells absorb the radioisotope more than the normal cells do and receive a higher dose of radioactivity. This causes the cancer cells to die.
Before you have any treatment with a radioisotope, you will be given detailed information about it.