Noun1.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) half life period,period of time,time period- an amount of time; "a time period of 30 years"; "hastened the period...
For a given reaction the half-life, t1/2, of a reactant is the time required for its concentration to reach a value that is the arithmetic mean of its initial and final (equilibrium) value.
The elimination half-life (T1/2) is the time it takes for the elimination processes to reduce the plasma concentration or the amount of drug in the body by 50 percent. From:The Practice of Medicinal Chemistry (Fourth Edition),2008
Class 12 CHEMISTRY The half-life period...The half-life period of a radioactive element is 1.4×1010 years. Calculate the time in which the activity of the element is reduced to 90% of its original value. Video SolutionStruggling With Chemical Kinetics? Get Allen’s Free Flashcards Free ...
The biological half-life of a molecule is described as ‘the time required to lose half of the pharmacologic/physiologic activity of the molecule in the in vivo system’. From: Toxicology Letters, 2012 About this pageAdd to MendeleySet alert ...
The half life period of a first order reaction, A → Product is 10 minutes. In how much time is the concentration of A reduced to 10% of its original concentration? View Solution In a first-order reaction A→B, if k is rate constant and initial concentration of the reactant A is ...
analysisofdisciplinehalf-lifechemistryinchinabasedonbibliometrics 系统标签: 半衰期学科计量学文献bibliometricschemistry 2014年第4期 1引言 为了揭示某篇文献的贡献随时间变化 规律,半衰 期这一概念最早是由J.D.Bernal从自然科学领域引入到 图书情报学科中,经过若干年的不断研究和发展 产生了 文献 衰期、期刊 衰期...
Many people think that the half-life of a radioactive element represents the amount of time an element is radioactive. In fact, it is the time required for half—not all—of the element to decay radioactively. Occasionally, however, the daughter element is also radioactive, so its radioacti...
Half-life is defined as the time required for half of the unstable nuclei to undergo their decay process. Each substance has a different half-life. For example, carbon-10 has a half-life of only 19 seconds, making it impossible for this isotope to be encountered in nature. Uranium-233, ...
Period (half-life period) Definition The half-lifeT1/2is the time required to halve the number of atoms of a particular radioactive nuclide. It relates to thedecay constantλ throughT1/2= ln 2/λ ≈ 0.69/λ. Author information Authors and Affiliations ...