| 单词 | radioactive equilibrium |
| 释义 | > as lemmasradioactive equilibrium radioactive equilibrium n. Physics a condition in which the quantities of radioactive daughter nuclides in a material remain constant because they are formed from the parent as fast as they decay. ΘΚΠ the world > matter > physics > atomic nucleus > radioactive isotope > radioactive nuclide > [noun] > stability of daughter decay radioactive equilibrium1904 1904 E. Rutherford Radio-activity vii. 189 In uranium and thorium compounds there is a continuous production of active matter which keeps the compound in radio-active equilibrium. 1946 Physical Rev. 69 672/2 Since the age of the earth is much greater than the life of C14 a radioactive equilibrium must exist in which the rate of disintegration of C14 is equal to the rate of production. 1992 Cambr. Encycl. Human Evol. (1994) v. iii. 182/2 An uranium-containing mineral will in time contain each one of the elements in the decay series, in a concentration related to each element's half-life. This condition is termed radioactive equilibrium. < as lemmas |
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