A gallium scan or gallium 67 scan (also called "gallium imaging") is a type of nuclear medicine study that uses a radioactive tracer to obtain images of a specific type of tissue, or disease state of tissue. Gallium salts like gallium citrate and gallium nitrate are used. The form of salt is not important, since it is the freely dissolved gallium ion Ga+3 which is active. For these applications, the radioactive isotope gallium-67 (67Ga), which has a decay half-life of 3.26 days, is used.
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