Injection of a radioactive tracer into a patient's vein prior to taking a gamma camera scan. Note the protective lead shielding around both container & syringe. In this case, the radioisotope being used is technetium-99m (Tc-99m) linked to DTPA, a substance that is taken up & excreted by the kidneys. Technetium-99m is used for the majority of gamma scans, since it is readily linked to a variety of tracer chemicals that are taken up by various organs of the body, including bone, liver, kidneys and even blood cells. Gamma rays emitted from the tracer pass through the body to be mapped by an external gamma camera.
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