half life

from WordNet (r) 3.0 (2006)
half life
    n 1: the time required for something to fall to half its initial
         value (in particular, the time for half the atoms in a
         radioactive substance to disintegrate) [syn: {half life},
         {half-life}]
from Moby Thesaurus II by Grady Ward, 1.0
19 Moby Thesaurus words for "half life":
      activity, artificial radioactivity, contamination, curiage,
      decontamination, fallout, natural radioactivity, nuclear radiation,
      radiant energy, radiation, radioactive radiation, radioactivity,
      radiocarbon dating, radiolucency, radiopacity, radiosensibility,
      radiosensitivity, saturation point, specific activity
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