| 释义 |
radioactive decay
radioactive decayn.1. Spontaneous disintegration of a radionuclide with the emission of energetic particles or radiation, such as alpha or beta particles or gamma rays.2. An instance of such disintegration.radioactive decay n (Nuclear Physics) disintegration of a nucleus that occurs spontaneously or as a result of electron capture. One or more different nuclei are formed and usually particles and gamma rays are emitted. Sometimes shortened to: decay Also called: disintegration ra·di·o·ac·tive decay (rā′dē-ō-ăk′tĭv) The spontaneous breakdown of a radioactive nucleus into a lighter nucleus. Radioactive decay causes the release of radiation in the form of alpha particles, beta particles, or gamma rays. The end result of radioactive decay is the creation of a stable atomic nucleus.radioactive decayThe decrease in the radiation intensity of any radioactive material with respect to time.Thesaurus| Noun | 1. | radioactive decay - the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiationdisintegration, decayalpha decay - radioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particlebeta decay - radioactive decay of an atomic nucleus that is accompanied by the emission of a beta particlenuclear reaction - (physics) a process that alters the energy or structure or composition of atomic nuclei |
Translations
radioactive decay
radioactive decay (ray-dee-oh-ak -tiv) The spontaneous transformation of one atomic nucleus into another with the emission of energy. The energy is released in the form of an energetic particle, usually an alpha particle, beta particle (i.e. an electron), or positron, sometimes accompanied by a gamma-ray photon. The unstable isotopes of an element that can undergo such transformations are called radioactive isotopes, or radioisotopes. The emission of a particle from the nucleus of a radioisotope results in the production of an isotope of a different element, as in the beta decay of carbon–14 to nitrogen–14 or the alpha decay of radium–226 to radon–222. The isotope produced is itself often radioactive. The average time taken for half a given number of nuclei of a particular radioisotope to decay is the half-life of that radioisotope; values range from a fraction of a second to thousands of millions of years. See also radiometric dating. radioactive decay[¦rād·ē·ō′ak·tiv di′kā] (nuclear physics) The spontaneous transformation of a nuclide into one or more different nuclides, accompanied by either the emission of particles from the nucleus, nuclear capture or ejection of orbital electrons, or fission. Also known as decay; nuclear spontaneous reaction; radioactive disintegration; radioactive transformation; radioactivity. radioactive decay
radioactive decayThe continual loss of energy by radioactive substances. Disintegration of the nucleus by the emission of alpha, beta, or gamma rays eventually results in the complete loss of radioactivity. The time required for some materials to become stable may be minutes and, for others, thousands of years. See: half-lifeSee also: decayradioactive decay
Related to radioactive decay: alpha decay, half life, radioactivitySynonyms for radioactive decaynoun the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiationSynonymsRelated Words- alpha decay
- beta decay
- nuclear reaction
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