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 is a molybdenum-99 generator producing technetium-99 for nuclear medicine diagnostic procedures. Such a generator is sometimes called a cow because the daughter product, in this case technetium-99, is milked at regular intervals. Transient equilibrium occurs after four half-lives, on average.
Read more about Transient Equilibrium: Activity in Transient Equilibrium, Time of Maximum Daughter Activity, See Also
Famous quotes containing the words transient and/or equilibrium:
“A creature not too bright or good
For human nature’s daily food;
For transient sorrows, simple wiles,
Praise, blame, love, kisses, tears, and smiles.”
—William Wordsworth (1770–1850)
“That doctrine [of peace at any price] has done more mischief than any I can well recall that have been afloat in this country. It has occasioned more wars than any of the most ruthless conquerors. It has disturbed and nearly destroyed that political equilibrium so necessary to the liberties and the welfare of the world.”
—Benjamin Disraeli (1804–1881)