Radioisotope or Radionuclide
Atoms are made up of protons, neurons and electrons. The number of protons in an atom determines what type of atom it is. However, atoms of the same type can have variable numbers of neutrons. These are called isotopes.
Some isotopes are unstable and radioactive. These are called radioisotopes. Examples of radioisotopes used in our department are, iodine-125, iodine-131, technetium-99m and iridium-192. Radioisotopes may be used for treatment or for imaging.