
In nuclear physics, transient equilibrium is a situation in which equilibrium is reached by a parent-daughter radioactive isotope pair where the half-life of the daughter is shorter than the half-life of the parent. Contrary to secular equilibrium, the half-life of the daughter is not negligible compared to parent`s half-life. An example of this ....
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http://en.wikipedia.org/wiki/Transient_equilibrium

Type: Term Definitions: 1. a type of radioactive equilibrium in which the half-life of the parent radioisotope is longer than that of the daughter so that the ratio of activities of parent and daughter become constant as they decrease with time.
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http://www.medilexicon.com/medicaldictionary.php?t=30092
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