New Collegiate Dictionary. 2001.
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
