alpha particle

alpha particle
noun Date: 1903 a positively charged nuclear particle identical with the nucleus of a helium atom that consists of two protons and two neutrons and is ejected at high speed in certain radioactive transformations — called also alpha, alpha ray

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Alpha particle — Alpha particles (named after and denoted by the first letter in the Greek alphabet, α) consist of two protons and two neutrons bound together into a particle identical to a helium nucleus; hence, it can be written as He2+ or 42He2+. They are a… …   Wikipedia

  • alpha particle — (Physics & Chem.) a particle emitted at high velocity from certain radioactive substances. It is identical to the helium nucleus, consisting of two protons and two neutrons. Rays of such particles are called {alpha rays}. [Webster 1913 Suppl.… …   The Collaborative International Dictionary of English

  • alpha particle — n. a positively charged particle given off by certain radioactive substances: it consists of two protons and two neutrons (a helium nucleus), and is converted into an atom of helium by the acquisition of two electrons …   English World dictionary

  • alpha particle — (also alpha ray) ► NOUN Physics ▪ a helium nucleus, especially as emitted by some radioactive substances …   English terms dictionary

  • Alpha particle — A tiny mass of material composed of two protons and two neutrons. Alpha particles do not travel very far from their radioactive source. They cannot pass through a piece of paper, clothes or even the layer of dead cells which normally protects the …   Medical dictionary

  • alpha particle — noun a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes • Hypernyms: ↑particle, ↑subatomic particle * * * ˈalpha particle [alpha particle] noun ( …   Useful english dictionary

  • alpha particle — UK / US noun [countable] Word forms alpha particle : singular alpha particle plural alpha particles physics the nucleus of a helium atom that is produced by some radioactive substances …   English dictionary

  • alpha particle — alfa dalelė statusas T sritis fizika atitikmenys: angl. alpha particle vok. Alpha Teilchen, n rus. альфа частица, f pranc. particule alpha, f …   Fizikos terminų žodynas

  • alpha particle — alfa dalelė statusas T sritis Energetika apibrėžtis Helio atomo branduolys. atitikmenys: angl. alpha particle vok. Alpha Teilchen, n rus. альфа частица, f pranc. particule alpha, f …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • alpha particle — alfa dalelė statusas T sritis chemija apibrėžtis ⁴₂He branduolys. atitikmenys: angl. alpha particle rus. альфа частица …   Chemijos terminų aiškinamasis žodynas

  • alpha particle — alfa dalelė statusas T sritis apsauga nuo naikinimo priemonių apibrėžtis Radioaktyviųjų izotopų alfa skilimo produktas; teigiamoji elektringoji dalelė, helio (He) atomo branduolys. Alfa dalelė sudaryta iš dviejų neutronų ir dviejų protonų. Dėl… …   Apsaugos nuo naikinimo priemonių enciklopedinis žodynas

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