1) Chemical kinetic 2) Debut novel 3) Exclusively Anglo word 4) Exclusively Saxon word 5) GoldSrc engine game 6) Laboratory in fiction 7) MacOS game 8) Valve Corporation game 9) Windows game 10) Word with Anglo-Saxon origins 11) Word of purely Anglo origin
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The half life of a reaction is the time required for the amount of reactant to drop to one half its initial value.
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in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other ... [12 related articles]
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The amount of time it takes for half an initial amount to disintegrate.
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http://www.chemicalglossary.net/definition/799-Half_Life
The period required for the disintegration of half the atoms in a given amount of a specific radioactive substance. The half life varies for specific radioisotopes.
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Decay curve of tritium (H-3) – half-life 12.3 years Credit: European Nuclear Society The time taken for a substance or collection of particles to decay by half of its original amount. Half-life, denoted T
½, is a useful concept by which to express the rate of...
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http://www.daviddarling.info/encyclopedia/H/half-life.html
The Half-life, t
½, is the time required for the activity of a radioactive isotope to fall to one-half of its original value. This may also be expressed in terms of the amount of the material in grams. It is a constant for a given isotope and does not depend on the particular compound in which it is present. It is impossible to know...
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http://www.encyclo.co.uk/local/20138
1. <pharmacology> The period over which the concentration of a specified chemical or drug takes to fall to half its original concentration in the specified fluid or blood. ... 2. <radiobiology> The time required to reduce the amount of a radionuclide to one-half the amount originally present. Physical or radioactive half-life refers to ...
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(haf´līf″) the time required for the decay of half of a sample of particles of a radionuclide or elementary particle; see also radioactivity. Symbol t1/2 or T1/2.
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the time any substance takes to decay by half of its original amount. See also biological half-life, decay constant, effective half-life, radioactive half-life.
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The time necessary for half of the atoms of a parent isotope to decay into the daughter isotope.
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http://www.encyclo.co.uk/local/22291
(= t1/2) The period over which the activity or concentration of a specified chemical or element falls to half its original activity or concentration. Typically applied to the half-life of radioactive atoms but also applicable to any other situation where the population is of molecules of diminishing concentration or activity.
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is the time required for a pollutant to lose one-half of its original concentration, or the time required for half of the atoms of a radioactive element to decay or the time required for the elimination of half a total dose from the body
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http://www.epaw.co.uk/EPT/glossary.html
Half-life is closely related to the property of Radioactive Decay and represents the time taken for half the Atoms in a Radioactive substances to undergo decay and change into another nuclear form (either a radioactive daughter product or a stable form). It is therefore the time taken for the Activity of a radioactive sample to decay by half and i....
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http://www.ionactive.co.uk/glossary_atoz.html?s=az&t=h
A formula for estimating the total response to be expected from a direct-response effort shortly after the first responses are received. Makes valid continuation decisions possible based on statistically valid partial data. See doubling day.
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In chemistry, half-life is the length of time required for one-half of a radioactive substance to disintegrate.
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The time required for half of a homogeneous sample of radioactive material to decay.
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The amount of time it takes for half an initial amount to disintegrate.
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http://www.shodor.org/UNChem/glossary.html
The half-life of a radioactive material is the time taken for its activity level to drop by a half. Half-life is measured using any unit of time (seconds, hours etc). For example, if the activity of a sample is 20MBq at 12:00 pm, falling to 10 MBq at 2:00 pm, then the half-life is 2 hours. At 4:00 pm the activity will be 5 MBq, etc. There is a dra...
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The amount of time required for half of a given substance to be eliminated from the body.
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[
n] - 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)
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1. The time required for a pollutant to lose one-half of its original coconcentrationor example, the biochemical half-life of DDT in the environment is 15 years. 2. The time required for half of the atoms of a radioactive element to undergo self-transmutation or decay (half-life of radium is 1620 years). 3. The time required for the elimination of ...
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The amount of time it takes for half an initial amount to disintegrate. Longer half lives typically correspond to lower radioactivity. Tritium, the heaviest isotope of hydrogen, decays with a relatively short half life of 12.3 years.
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https://www.encyclo.co.uk/local/20687
During radioactive decay, the time in which the activity of a radioactive source decays to half its original value (the time taken for half the atoms to decay). In theory, the decay process is never complete and there is always some residual radioactivity. For this reason, the half-life of a radioactive isotope is measured, rather than the tota...
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https://www.encyclo.co.uk/local/21221
The amount of time that it takes for one half of an original population of atoms of a radioactive isotope to decay.
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https://www.encyclo.co.uk/local/22327
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