Time for the amount of radioactivity in a living organism to be reduced to half of its value existing at an earlier initial time. The amount diminishes due to two concurrent processes: radioactive decay and clearance from the system. If just the former occurs, this effective half-life is independent of initial time and is equal to the isotope’s half-life. When there is biological clearance of a substance, there is also its associated half-life.


Volume Curve Radioactive Decay Extraction Fraction Electron Volt Concurrent Process 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.University of TennesseeKnoxvilleUSA

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