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Half-life

Half-life (symbol t½) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive. The term is also used more generally to characterize any type of exponential (or, rarely…

Formulas for half-life in exponential decay, In biology and pharmacology & Overview

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Formulas for half-life in exponential decay

MolesPositive numberMean lifetimeDecay constantNatural logarithm of 2
13 related topics

In biology and pharmacology

Blood plasmaTissuesMetabolitesReceptorCaesium
9 related topics

Overview

Nuclear physicsAtomsRadioactive decayExponentialRate law
14 related topics

Probabilistic nature

ProbabilityOn averageLaw of large numbersComputer program
4 related topics

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Overview

Probabilistic nature

Formulas for half-life in exponential decay

In biology and pharmacology

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Map overview Semantic statistics

Half-life

Nodes45
Edges44
Triples42
Avg. degree1.96
Density0.044444
Components1

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Half-life

Top relations

related to Examples · 10
Half-life → As, For, In, It, L/R, RC, RL, See List, The, There
related to External links · 10
Half-life → Bucknell, Comprehensive, Decay Engine, Interactive, Nikhef, Nucleonica, System Dynamics, Time Constants, UvA, Xe-124
related to Decay by two or more processes · 6
Half-life → Decay, Exponential, For, In, Some, T½
is a · 4
Half-life → length of time after which there is a 50, time it takes for a substance, time required for exactly half of the entities to decay, time required for exactly half of the entities to decay on average
related to Probabilistic nature · 3
Half-life → For, In, Instead
related to Formulas for half-life in exponential decay · 2
Half-life → An, N0
related to In biology and pharmacology · 2
Half-life → In, The
related to In non-exponential decay · 2
Half-life → In, The
see also · 2
Half-life → Half, List
related to Half-life and reaction orders · 1
Half-life → In

Important terminology Word statistics

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Important terminology

decay time concentration radioactive exponential half reaction rate initial constant order displaystyle t½ substance example quantity term atoms frac value

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Half-lifeis atime required for exactly half of the entities to decay0.90text
Half-lifeis atime required for exactly half of the entities to decay on average0.90text
Half-lifeis alength of time after which there is a 500.90text
Half-lifeis atime it takes for a substance0.90text
Half-liferelated to Decay by two or more processesSome0.60section
Half-liferelated to Decay by two or more processesIn0.60section
Half-liferelated to Decay by two or more processesT½0.60section
Half-liferelated to Decay by two or more processesFor0.60section
Half-liferelated to Decay by two or more processesExponential0.60section
Half-liferelated to Decay by two or more processesDecay0.60section
Half-liferelated to ExamplesThere0.60section
Half-liferelated to ExamplesFor0.60section

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