Technetium-99m (Tc-99m) undergoes a type of nuclear decay known as an isomeric transition when it emits gamma radiation. Specifically, Tc-99m undergoes an isomeric transition to its more stable state, technetium-99 (Tc-99), through the emission of gamma rays.
The isomeric transition involves a change in the nuclear energy state of the atom without a change in its chemical properties. In the case of Tc-99m, the metastable state (m) refers to a higher-energy state with a relatively short half-life, and the isomeric transition involves the release of a gamma-ray photon as the nucleus transitions to a lower-energy state.
The gamma rays emitted during the isomeric transition of Tc-99m are of diagnostic interest in nuclear medicine. Tc-99m is widely used as a radiopharmaceutical in various medical imaging procedures, including single-photon emission computed tomography (SPECT). The emitted gamma rays are detected by gamma cameras to create images that provide valuable diagnostic information about the structure and function of organs and tissues in the body.
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