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positron
(redirected from Positrons)

    Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia, Hutchinson 0.02 sec.
positron /pos·i·tron/ (poz´ĭ-tron) the antiparticle of an electron; a positively charged electron.
pos·i·tron (pz-trn)
n.
A positively charged particle of the same mass and magnitude of charge as an electron. Also called antielectron, positive 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 (PET)
positron
[pos′itron]
a positively charged particle emitted from neutron-deficient radioactive nuclei; the antiparticle of an electron.
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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