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radioactive elements

См. также в других словарях:

  • radioactive series — n. a series of unstable radioactive elements and isotopes, in which a given element or isotope beginning the series decays into and is succeeded by the next in the series, and so on until a stable nucleus is arrived at …   English World dictionary

  • 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

  • Radioactive contamination — The radiation warning symbol (trefoil) …   Wikipedia

  • radioactive element — a chemical element that spontaneously transmutes into another element with emission of corpuscular or electromagnetic radiations. The natural radioactive elements are all those with atomic numbers above 83, and certain other elements, such as… …   Medical dictionary

  • ÉLÉMENTS SUPERLOURDS — Il existe actuellement cent sept éléments chimiques connus, dont quatre vingt neuf éléments naturels et dix huit créés artificiellement par l’homme. Les plus lourds ont des noyaux tellement radioactifs que leur durée de vie est de plus en plus… …   Encyclopédie Universelle

  • Radioactive scrap metal — is the situation when radioactive material enters the metal recycling process known as the scrap metal trade. Overview A lost source accident [P Ortiz, V Friedrich, J Wheatley and M Oresegun, [http://www.iaea.org/Publications/Magazines/Bulletin/Bu… …   Wikipedia

  • radioactive dating — ☆ radioactive dating n. the determination of the age of an artifact, bone, rock, etc. based on the known rates of decay of radioactive isotopes of various elements * * * …   Universalium

  • radioactive dating — ☆ radioactive dating n. the determination of the age of an artifact, bone, rock, etc. based on the known rates of decay of radioactive isotopes of various elements …   English World dictionary

  • radioactive — [rā΄dē ō ak′tiv] adj. [ RADIO + ACTIVE] giving off, or capable of giving off, radiant energy in the form of particles or rays, as alpha, beta, and gamma rays, by the spontaneous disintegration of atomic nuclei: said of certain elements, as… …   English World dictionary

  • Radioactive decay — For particle decay in a more general context, see Particle decay. For more information on hazards of various kinds of radiation from decay, see Ionizing radiation. Radioactive redirects here. For other uses, see Radioactive (disambiguation).… …   Wikipedia

  • Éléments chimique — Élément chimique Pour les articles homonymes, voir Élément. On définit par élément chimique, ou simplement élément, une catégorie d atomes ayant en commun le même nombre de protons dans leur noyau atomique, ce nombre, noté Z, définissant le… …   Wikipédia en Français

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