同位素样品中半数原子核发生放射性衰变所需的时间。
物质(药物、放射性核素或其他)失去其一半药理学、生理学或放射学活性所需的时间。；半排出期；[化] 半衰期; 半寿期
同位素样品中半数原子核发生放射性衰变所需的时间。
The time required for half the nuclei in a sample of an isotope to undergo radioactive decay.
物质(药物、放射性核素或其他)失去其一半药理学、生理学或放射学活性所需的时间。
The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity.
一种观念或时尚失去其一半影响力所需的时间。
The amount of time it takes for an idea or a fashion to lose half of its influential power.
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