| 单词 | transient equilibrium |
| 释义 | > as lemmastransient equilibrium transient equilibrium n. Nuclear Physics a type of radioactive equilibrium in which the half-lives of the parent and daughter isotopes are such that the total radioactivity decays with the parent's half-life and the ratio of parent to daughter atoms remains constant. ΘΚΠ the world > matter > physics > atomic nucleus > radioactive isotope > radioactive nuclide > [noun] > average duration > time of decrease > in parent-daughter situation transient equilibrium1912 1912 W. Makower & H. Geiger Pract. Measurem. in Radio-activity viii. 111 The name transient equilibrium has been given to this state of apparent equilibrium, which exists whenever the life of a product is not negligibly short compared with that of the preceding substance which controls the decay. 1961 G. R. Choppin Exper. Nucl. Chem. vi. 84 For a parent with a 1 month half life, observation over a few days will seem to be secular equilibrium, whereas observation over a 3 month period will show transient equilibrium. 2004 J. A. Purdy in E. C. Halperin et al. Perez & Brady's Princ. & Pract. Radiation Oncol. (ed. 5) v. 146/1 Transient equilibrium is established when the parent nuclide's half-life is not much greater than the daughter nuclide's half life. < as lemmas |
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