positron

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Related to Positrons: antimatter, Mesons, neutrinos

positron

 [poz´ĭ-tron]
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.

pos·i·tron (β+),

(poz'i-tron),
A subatomic particle of mass and charge equal to the electron but of opposite (that is, positive) charge.
Synonym(s): positive electron

positron

/pos·i·tron/ (poz´ĭ-tron) the antiparticle of an electron; a positively charged electron.

positron

[pos′itron]
a positively charged particle emitted from neutron-deficient radioactive nuclei; the antiparticle of an electron.

pos·i·tron

+) (poz'i-tron)
A subatomic particle of mass and charge equal to the electron but of opposite (i.e., positive) charge.

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.

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).
References in periodicals archive ?
Positron emission tomography is the diagnostic medical procedure of producing a positron emission tomography scan to examine metabolic activity of the tissues particularly the brain tissue, using a radioactive isotope administered intravenously.
He adds that the jets probably also include pairs of positrons and electrons, as well as photons.
When positrons (also called positive electrons) collide with ordinary, negatively charged electrons, they mutually destroy each other and spawn gamma rays that have a very specific energy: 511,000 electron volts.
About Positron Systems' Induced Positron Annihilation (IPA) Technologies
More than 40 years ago, experimenters succeeded in coaxing electrons and positrons into a short-lived coexistence as positronium, a hydrogenlike atom with a positron replacing the proton.
Selection for this Phase Two SBIR grant is a significant milestone for Positron Systems since this is only the fourth National Science Foundation Phase Two award granted to an Idaho Company since the SBIR program was started in 1983.
The pattern of polarization found by Wardle's team indicates that the electrons' positively charged companions are mostly positrons.
One possibility is that a positron may merge briefly with a quark, creating a particle that theorists call a leptoquark.
To beat this deadline, Gabrielse and his coworkers are rushing to complete preparations for an attempt to create antihydrogen by bringing together positrons and antiprotons and storing the resulting antimatter in traps for hours or longer.
Hitachi's subsidiary company) today announced that they have delivered the first dedicated radioisotope production system in Japan utilizing a Positron Tracer Production System, a linear accelerator developed by AccSys for use in Positron Emission Tomography (PET).
Guided by strong magnetic fields, a fraction of these positrons strikes a tungsten crystal, which slows down the particles (see diagram).
The new phase of improvements will include doubling or tripling the intensity of the collider's electron and positron beams.