Alpha rays
Alpha rays Alpha rays (Physics & Chem.) Rays of relatively low penetrating power emitted by radium and other radioactive substances, and shown to consist of positively charged {alpha particles} (helium nuclei) having enormous velocities but small masses. They are slightly deflected by a strong magnetic or electric field. Compare {beta ray} and {gamma ray}. Because the rays penetrate only a small distance in dense matter such as living tissue, small pellets of radioactive substances emitting alpha rays have been used to cause local destruction of tissue, as in cancer therapy. [Webster 1913 Suppl. +PJC]

The Collaborative International Dictionary of English. 2000.

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  • alpha rays — alpha radiation or alpha rays noun (physics) A stream of alpha particles • • • Main Entry: ↑alpha * * * alpha rays or alpha radiation, Physics. a stream of alpha particles: »Alpha radiation consists of…high energy particles [that] have low… …   Useful english dictionary

  • alpha rays — alpha rays. См. альфа излучение. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • alpha rays — alfa spinduliuotė statusas T sritis fizika atitikmenys: angl. alpha radiation; alpha rays; alpha particle radiation vok. Alphastrahlen, m; Alpha Strahlung, f; Alphastrahlung, f rus. альфа излучение, n; альфа лучи, m pranc. radiation alpha, f;… …   Fizikos terminų žodynas

  • alpha rays — alfa spinduliai statusas T sritis chemija apibrėžtis Labai siauras alfa dalelių pluoštas. atitikmenys: angl. alpha rays rus. альфа лучи …   Chemijos terminų aiškinamasis žodynas

  • alpha rays — alfa spinduliai statusas T sritis augalininkystė apibrėžtis Alfa dalelių srautas, skleidžiamas radioaktyviųjų medžiagų. atitikmenys: angl. alpha rays rus. альфа лучи …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • alpha rays — high speed helium nuclei that have been ejected from radioactive substances. Owing to their high velocity (one tenth that of light) their kinetic energy is so great that a single alpha particle produces a microscopic flash of light when it hits a …   Medical dictionary

  • alpha rays — streams of alpha particles (Physics) …   English contemporary dictionary

  • 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 — 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-Strahlung — alfa spinduliuotė statusas T sritis fizika atitikmenys: angl. alpha radiation; alpha rays; alpha particle radiation vok. Alphastrahlen, m; Alpha Strahlung, f; Alphastrahlung, f rus. альфа излучение, n; альфа лучи, m pranc. radiation alpha, f;… …   Fizikos terminų žodynas

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