Half-Life
| Definition: |
The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. |
| Notes: |
almost never IM; no qualif; may refer to radioactivity, metabolized substances or cells |
| Previously Indexed: |
Time (1966-1970),specific radioisotope, substance, or cell |
Half-Life Definitions and Terms
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