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half-life noun

  /ˈhæfˌlaɪf/
  • (physics) The time required for half the nuclei in a sample of an isotope to undergo radioactive decay.
  • (chemistry) In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.
  • (medicine) The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity.
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