8]. The most common route of administration is intravenous, but radiopharmaceuticals may be administered orally or by inhalation. The intramuscular, intracavity and intrathecal routes are possible, but rare.
When deciding upon the efficacy of a given radiopharmaceutical, the physical and chemical properties of the radionuclide, together with biochemical, physiological and pharmacological properties of the pharmaceutical, must be considered.