NCIt definition : Time for the amount of a radionuclide in a living organism to be reduced to half of
its value at a given initial time. The amount diminishes due to 2 concurrent processes:
radioactive decay, and clearance from the system.;
Alternative definition : CDISC: The drug half-life that quantifies the accumulation ratio of a drug following
multiple dosing.;
Currated CISMeF NLP mapping