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Positron |
Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia, Hutchinson | 0.04 sec. |
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positron /pos·i·tron/ (poz´i-tron) the antiparticle of an electron; a positively charged electron.
Positron One of the small particles that make up an atom. A positron has the same mass and amount of charge as an electron, but the positron has a positive charge. Mentioned in: Positron Emission Tomography positron the antiparticle of the electron. When a positron is emitted by a radionuclide it combines with an electron and both undergo annihilation, producing two 511 keV gamma rays traveling in opposite directions. This effect is used in positron emission tomography (PET). |
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Positron
