atomic disintegration or decay

См. также в других словарях:

• decay — decayable, adj. decayedness /di kayd nis, kay id /, adj. decayless, adj. /di kay /, v.i. 1. to become decomposed; rot: vegetation that was decaying. 2. to decline in excellence, prosperity, health, etc.; deteriorate. 3. Physics. (of a radioactive …   Universalium

• decay — de•cay [[t]dɪˈkeɪ[/t]] v. i. 1) mcr to become decomposed; rot 2) to decline in health, prosperity, etc.; deteriorate 3) phs (of an atomic nucleus) to undergo radioactive disintegration 4) mcr to cause to decompose; rot 5) mcr decomposition; rot… …   From formal English to slang

• beta decay — noun radioactive decay of an atomic nucleus that is accompanied by the emission of a beta particle • Hypernyms: ↑decay, ↑radioactive decay, ↑disintegration * * * ˈbeta decay 7 [beta decay] noun …   Useful english dictionary

• beta decay — disintegration of the nucleus of an unstable radionuclide in which the mass number is unchanged, but the atomic number is increased or decreased by 1, as result of emission of a negatively or positively charged (beta) particle and a neutrino …   Medical 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

• beta decay — Physics. a radioactive process in which a beta particle is emitted from the nucleus of an atom, raising the atomic number of the atom by one if the particle is negatively charged, lowering it by one if positively charged. [1930 35] * * * Any of… …   Universalium

• radioactive decay — noun the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation • Syn: ↑decay, ↑disintegration • Derivationally related forms: ↑disintegrate (for: ↑disintegration), ↑decay ( …   Useful english dictionary

• 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 decay — noun radioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particle • Hypernyms: ↑decay, ↑radioactive decay, ↑disintegration * * * noun : the radioactive decay of an atomic nucleus by emission of an alpha particle …   Useful english dictionary

• radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… …   Universalium

• Radium — Ra di*um (r[=a] d[i^]*[u^]m), n. [NL., fr. L. radius ray.] (Chem.) An intensely radioactive metallic element found (combined) in minute quantities in pitchblende, and various other uranium minerals. Symbol, Ra; atomic weight, 226.4. Radium was… …   The Collaborative International Dictionary of English