radioactivity equilibrium

radioactivity equilibrium

[‚rād·ē·ō·ak′tiv·əd·ē ‚ē·kwə′lib·rē·əm]
(nuclear physics)
A condition which may arise in the decay of a radioactive parent with short-lived descendants, in which the ratio of the activity of a parent to that of a descendant remains constant.
References in periodicals archive ?
Concentration of [sup.238]U in investigated rocks calculated with assumption of radioactivity equilibrium in uranium series varies in the range from 3.6 ppm (hornfels collected from the pyrite mine) to 6.3 ppm (sample taken from the "contact").