Medical Definition half-life noun ˈhaf-ˌlīf ˈhȧf- : the time required for half of something to undergo a process: as a : the time required for half of the atoms of a radioactive substance to become disintegrated b : the time required for half the amount of a sub...
Physics. the time required for one half the atoms of a given amount of a radioactive substance to disintegrate. Also called bi·o·log·i·cal half-life [bahy, uh, -, loj, ik, uh, l , haf, -lahyf]. Pharmacology. the time required for the activity of a substance taken into the ...
Define half-lifes. half-lifes synonyms, half-lifes pronunciation, half-lifes translation, English dictionary definition of half-lifes. n. 1. Physics The time required for half the nuclei in a sample of a specific isotopic species to undergo radioactive d
Definition of half-life noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
from the definition of reaction half-life, at t = t 1/2 , [r] = [r] 0 /2. substituting these values in the expression for the first-order rate constant, the following equation is obtained: \(\begin{array}{l}k = \frac{2.303}{t_{1/2}}log\frac{[r_0]}{[r]_0/2}\end{...
Also calledbi·o·log·i·cal half-life[bahy, uh, -, loj, ik, uh, l , haf, -lahyf].Pharmacology.the time required for the activity of a substance taken into the body to lose onehalfits initial effectiveness. Informal.a brief period during which something flourishes before dying out. ...
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In the case of one atomic nucleus, the common definition of half-life can be inverted: the probability of that nucleus decaying in less time than its half-life is about 50%. Radioactive Decay Equation There are three equivalent equations that give the number of nuclei remaining at time ...
Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay, or, equivalently, the time interval required for the number of disintegrations per second of a radioactive material to decrease
Synonyms Biological half-life; Elimination half-life Definition Half-life is defined as the time interval required for a quantity undergoing exponential decay to reach half of its initial value. In the context of a drug injection, half-life refers to the interval required for drug levels from a...