English-Russian base dictionary . 2014.

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  • 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

  • List of alpha emitting materials — At least the following radioactive materials are known to emit alpha particles.* 209Bi, 211Bi, 212Bi, 213Bi * 210Po, 211Po, 212Po, 214Po, 215Po, 216Po, 218Po * 215At, 217At, 218At * 218Rn, 219Rn, 220Rn, 222Rn, 226Rn * 221Fr * 223Ra, 224Ra, 226Ra… …   Wikipedia

  • 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… …   The Collaborative International Dictionary of English

  • Alpha decay — 2 less. For example:(The second form is preferred because the first form appears electrically unbalanced. Fundamentally, the recoiling nucleus is very quickly stripped of two electrons to neutralize the ionized helium cation.)An alpha particle is …   Wikipedia

  • alpha emitter — noun a radioactive substance that decays by emitting alpha particles See Also: alpha emission …   Wiktionary

  • alpha decay — noun Radioactive decay by emitting an alpha particle …   Wiktionary

  • alpha radiation — /ˌælfə reɪdiˈeɪʃən/ (say .alfuh raydee ayshuhn) noun radiation consisting of streams of positively charged particles emitting from some naturally occurring elements as radium and uranium, as well as from some synthetic elements …  

  • H-alpha — In physics and astronomy, H alpha, also written Hα, is a specific emission line created by hydrogen at 6562.8 Angstroms.According to the Bohr model of the atom, electrons exist in quantized energy levels surrounding the atom s nucleus. These… …   Wikipedia

  • Lyman-alpha blob — A Lyman alpha blob (LAB) is a huge concentration of a gas emitting the Lyman alpha emission line. The Lyman alpha emission line is produced by recombination of electrons with ionized hydrogen atoms. LABs are some of the largest known individual… …   Wikipedia

  • radioactivity — /ray dee oh ak tiv i tee/, n. Physics, Chem. the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element. Also called activity. [1895… …   Universalium

  • Radioactive waste — 2007 ISO radioactivity danger logo, designed in part for long term radioactive waste depositories which might survive into a far future time in which all knowledge of the meaning of present common radiation danger symbols and signs has been lost… …   Wikipedia

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