half-life
/ˈhæfˌlaɪf/
The time required for half the nuclei in a sample of an isotope to undergo radioactive decay; In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value; The time it takes for a substance to lose half of its pharmacological, physiologic, or radiological activity
- мн. число
- half-lives
Значения
- 1
The time required for half the nuclei in a sample of an isotope to undergo radioactive decay
- 2
In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value
- 3
The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity
- 4
The amount of time it takes for an idea or a fashion to lose half of its influential powerредкое