| 单词 | radioactive decay |
| 释义 | radioactive decay[ rey-dee-oh-ak-tiv di-key ] / ˌreɪ di oʊˈæk tɪv dɪˈkeɪ / SEE SYNONYMS FOR radioactive decay ON THESAURUS.COM noun Physics.a radioactive process in which a nucleus undergoes spontaneous transformation into one or more different nuclei and simultaneously emits radiation, loses electrons, or undergoes fission. Also called dis·in·te·gra·tion [dis-in-tuh-grey-shuhn] /dɪsˌɪn təˈgreɪ ʃən/ . Origin of radioactive decayFirst recorded in 1960–65 Words nearby radioactive decayradioactinium, radioactivate, radioactive, radioactive constant, radioactive dating, radioactive decay, radioactive iodine, radioactive isotope, radioactive series, radioactive tracer, radioactive waste Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for radioactive decayradioactive decay noundisintegration 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 emittedSometimes shortened to: decay Also called: disintegration Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for radioactive decayradioactive decay [ rā′dē-ō-ăk′tĭv ] The spontaneous transformation of an unstable atomic nucleus into a lighter one, in which radiation is released in the form of alpha particles, beta particles, gamma rays, and other particles. The rate of decay of radioactive substances such as carbon 14 or uranium is measured in terms of their half-life. See also decay radioisotope. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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