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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 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 ...
In most problems, the half-life of a radioactive element is given to you. If you are given a problem where you are told how many half-lives have elapsed as well as how much time has passed, you can solve for the length of a half-life by using the equation T=t/n, where T i...
PROBLEMS 1. By direct measurement of the activity of thethyroidgland in several patients who had received131I for diagnostic purposes, it was observed that the biologicalelimination half-lifefor theradionuclidewas 5.22 days. What is the effective half-life and what is the value of the effective ...
Chapter 11: Nuclear Chemistry Search for: 11.2 Half-LifeLearning Objectives Define half-life. Determine the amount of radioactive substance remaining after a given number of half-lives. Whether or not a given isotope is radioactive is a characteristic of that particular isotope. Some isotopes are...
AnalysisofDisciplineHlf-lifeofChemistryin hinBsedon ibliometrics bstrctHalf-lifeisanimportantcriterionformeasuringliteratureobsolescencesothatstudyofdisciplinehalf-lifehelps todiscovertheagingcharacteristics.Choosingchemistryastheobjectofanalysis,thisarticleplacesemphasisondiscipline ...
Figure 1. Radioactive decay reduces the number of radioactive nuclei over time. In one half-lifet1/2, the number decreases to half of its original value. Half of what remains decay in the next half-life, and half of those in the next, and so on. This is an exponential decay, as ...
Half-life time (T) Total time (t) Remaining quantity (N(t)) Decay constant (λ) Mean lifetime (τ) Share resultReload calculator Check out 8 similar physical chemistry calculators 🥼 Diffusion coefficientGraham's law of diffusionLangmuir isotherm...5 moreCalculator...
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...