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<div style='text-align: center>;
<math>
\frac{1}{T_{eff}}=\displaystyle \sum_{i} \frac{1}{T_{i}}
</math>
</div>
where Ti <math>T_i</math> is the half-life for process <math>i</math>. Examples of the processes are physical decay of the radionuclide, physiological removal in the body and weathering in the environment.
''ICRP Glossary entry - June 2019''
'''Return to [[ICRP Glossary|Glossary]] entry - June 2019'''