- alpha radioactivity
- альфа-радиоактивность
Англо-русский словарь по экологии. 2011.
alpha radioactivity
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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
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 — /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
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 decay — Physics. a radioactive process in which an alpha particle is emitted from the nucleus of an atom, decreasing its atomic number by two. [1935 40] * * * Type of radioactive disintegration (see radioactivity) in which some unstable atomic nuclei… … Universalium
alpha emission — noun A form of radioactivity in which alpha particles are emitted from the nucleus of an atom See Also: alpha emitter … Wiktionary
radioactivity — The property of some atomic nuclei of spontaneously emitting gamma rays or subatomic particles (α and β rays) by the process of nuclear disintegration and measured in disintegrations per second (dps). One dps is equal to 1 becquerel, and 3.7 ×… … Medical dictionary
radioactivity — The spontaneous emission of radiation, generally alpha or beta particles, often accompanied by gamma rays, from the nuclei of an unstable isotope … Military dictionary
radioactivity — 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… … New Collegiate Dictionary
alpha particle — noun A positively charged nucleus of a helium 4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity … Wiktionary
radioactivity — noun a) Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus. b) The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons,… … Wiktionary
