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1 plutonium
[English Word] plutonium[Swahili Word] plutoni[Part of Speech] noun[Class] 9[Dialect] recent[English Definition] a radioactive metallic element similar chemically to uranium that is formed as the isotope 239 by decay of neptunium and found in minute quantities in pitchblende, that undergoes slow disintegration with the emission of an alpha particle to form uranium 235, and that is fissionable with slow neutrons to yield atomic energy (identified 1942)[Terminology] chemistry------------------------------------------------------------ -
2 polonium
[English Word] polonium[Swahili Word] poloni[Part of Speech] noun[Class] 9[Dialect] recent[English Definition] a radioactive metallic element that is similar chemically to tellurium and bismuth, occurs especially in pitchblende and radium-lead residues, and emits an alpha particle to form an isotope of lead (identified 1898)[Terminology] chemistry------------------------------------------------------------
См. также в других словарях:
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
