noun Etymology: International Scientific Vocabulary Date: 1899 the property possessed by some elements (as uranium) or isotopes (as carbon 14) of spontaneously emitting energetic particles (as electrons or alpha particles) by the disintegration of their atomic nuclei; also the rays emitted

New Collegiate Dictionary. 2001.

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  • radioactivity — a di*o*ac*tiv i*ty (r[=a] d[i^]*[ o]*[a^]k*t[i^]v [i^]*t[y^]), n. (Physics) a form of instability which is a property of the atomic nuclei of certain isotopes, which causes a spontaneous change in the structure of the nucleus, accompanied by… …   The Collaborative International Dictionary of English

  • radioactivity — radioactivity. См. радиоактивность. (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.

  • Radioactivity — Radioactivity. См. Радиоактивность. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • Radioactivity — См. Радиоактивность Термины атомной энергетики. Концерн Росэнергоатом, 2010 …   Термины атомной энергетики

  • radioactivity — (n.) 1899, from RADIOACTIVE (Cf. radioactive) + ITY (Cf. ity) …   Etymology dictionary

  • radioactivity — ► NOUN 1) the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei. 2) radioactive particles …   English terms dictionary

  • 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

  • radioactivity — noun … OF RADIOACTIVITY ▪ level ▪ The soil contains 30 times the acceptable level of radioactivity. VERB + RADIOACTIVITY ▪ produce, release ▪ the amount of radioactivity released b …   Collocations dictionary

  • radioactivity — n. 1) to emit, generate, produce radioactivity 2) (a) dangerous (level of) radioactivity * * * generate produce radioactivity (a) dangerous (level of) radioactivity to emit …   Combinatory dictionary

  • radioactivity — Synonyms and related words: activity, artificial radioactivity, contamination, curiage, decontamination, fallout, half life, natural radioactivity, nuclear radiation, radiant energy, radiation, radioactive radiation, radiocarbon dating,… …   Moby Thesaurus

  • radioactivity — ra|di|o|ac|tiv|i|ty [ˌreıdiəuækˈtıvıti US diou ] n [U] the sending out of ↑radiation (=a form of energy) when the ↑nucleus (=central part) of an atom has broken apart ▪ the discovery of radioactivity ▪ high levels of radioactivity …   Dictionary of contemporary English

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