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n. an electrically charged particle released in some radioactive decays, notably fluorine-18 or nitrogen-13, that has the same mass as an electron but opposite charge. It has a very short lifetime as it quickly reacts with an electron to produce a pair of gamma rays, which are emitted in diametrically opposite directions. The energy of each gamma ray is always 511 keV.

Subjects: Medicine and Health — Science and Mathematics.

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