By Harvey A. Ziessman, Janis P. O'Malley and James H. Thrall (Auth.)
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Additional info for Nuclear Medicine. The Requisites (Expert Consult–Online and Print)
The amount of emitted light affects both energy and, in the gamma camera, spatial resolution. Resolution is determined by the statistical variation of the collected light photons, which depends on the number of emitted photons. Finally, the response time affects the temporal resolution of the scintillator. The most common scintillation crystalline material used in nuclear medicine is thallium-drifted sodium iodide (NaI). Once the light is emitted in a scintillation detector, it must be collected and converted to an electrical signal.
The kinetic energy of these emitted conversion electrons is the difference in the two energy levels minus the electron’s binding energy. After the decay of I-131, its daughter, Xe-131, is in an excited state and almost immediately decays by isomeric transition with the emission of a 364-keV gamma ray (Fig. 3-6). In another example, Mo-99 decays to an excited state of Tc-99. , almost stable). The metastable state of Tc-99 has a 6-hour half-life and is referred to as Tc-99m. Tc-99m is the most commonly used radionuclide in nuclear medicine, in part because of its reasonable half-life, gamma ray energy (140 keV), and decay scheme (Fig.
18 9 F (110 min) The radioactive daughter may still be in an excited state, and thus further radioactive decays may occur. These radioactive daughters may decay to yet another radionuclide, but in some cases, they decay from one energy level to another while remaining the same nuclide (same Z and N numbers). This is referred to as an isomeric transition because the nuclide decays from one isomer (energy level) to another. This transition may result in the emission of a gamma ray, the energy of which is determined by the difference in the initial and eventual energy levels.