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| half-life | 1. <pharmacology> The period over which the concentration of a specified chemical or drug takes to fall to half its original concentration in the specified fluid or blood. 2. <radiobiology> The time required to reduce the amount of a radionuclide to one-half the amount originally present. Physical or radioactive half-life refers to reduction of activity by radioactive decay, biological half-life refers to biological elimination from the body and effective half-life refers to the combined action of radioactive decay and biological elimination. (16 Dec 1997) |
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Synonyms : Halflife, Half Life, Half-Lifes, Halflifes
| half-life |
half life: 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)
Ãâó: wordnet.princeton.edu/perl/webwn
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| half-life |
The time needed for one-half of a given amount of radioactive substance to decay.
Ãâó: highered.mcgraw-hill.com/sites/0072549238/student_...
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| half-life |
The time required for the level of a substance in the body (eg, a drug or toxin) to be reduced by half.
Ãâó: www.peteducation.com/dict_alpha_listing.cfm
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| half-life |
The length of time in which one-half of the nuclei of an unstable isotope of an element decay into smaller nuclei (releasing energy).
Ãâó: www.modernhumanorigins.com/h.html
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| half-life |
The time it takes for half of a drug dose to be eliminated from the bloodstream (or to be inactivated).
Ãâó: www.thebody.com/hivnews/aidscare/dec97/pullout.htm...
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| half-life | 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) |
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