Half-life
Half-life (symbol ) 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 ato ...
is a mathematical and scientific description of exponential or gradual decay.
Half-life, half life or halflife may also refer to:
Film and television
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''Half-Life'' (film), a 2008 independent film by Jennifer Phang
*''
Half Life: A Parable for the Nuclear Age'', a 1985 Australian documentary film
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"Half Life" (''Medical Investigation''), an episode of ''Medical Investigation''
Literature
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''Half Life'' (Jackson novel), a 2006 novel by Shelley Jackson
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''Half-Life'' (Krach novel), a 2004 novel by Aaron Krach
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''Halflife'' (Michalowski novel), a 2004 novel by Mark Michalowski
* ''
Rozpad połowiczny'' (), a 1988 award-winning dystopia novel by Edmund Wnuk-Lipiński
Music
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''Half Life'' (3 album) (2001)
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''Halflife'' (EP), an EP by Lacuna Coil and the title track
*''
Half-Life E.P.'', an EP by Local H
* "Half Life", a song by 10 Years from ''
The Autumn Effect
''The Autumn Effect'' is the third studio album by the Tennessee alternative metal band 10 Years. Produced by Josh Abraham, released on August 16, 2005 through Universal Records and Republic Records. Featured on the album is the popular modern ro ...
''
* "Half Life", a song by Come from ''
Near-Life Experience''
* "Half Life", a song by Imogen Heap from her album ''
Ellipse
In mathematics, an ellipse is a plane curve surrounding two focus (geometry), focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. It generalizes a circle, which is the special ty ...
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* "Half Life", a song by Prototype from the album ''
Trinity
The Christian doctrine of the Trinity (, from 'threefold') is the central dogma concerning the nature of God in most Christian churches, which defines one God existing in three coequal, coeternal, consubstantial divine persons: God the F ...
''
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Halflives, a French-Italian alternative rock band
Video games
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''Half-Life'' (series), a video game series developed by Valve
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''Half-Life'' (video game), the first game in the series
** ''
Half-Life 2
''Half-Life 2'' is a 2004 first-person shooter game developed by Valve. It was published by Valve through its distribution service Steam. Like the original ''Half-Life'' (1998), ''Half-Life 2'' combines shooting, puzzles, and storytelling, and ...
'', the second game in the series
** ''
Half-Life: Alyx'', a prequel to the events in the second game
See also
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Biological half-life
Biological half-life (also known as elimination half-life, pharmacologic half-life) is the time taken for concentration of a biological substance (such as a medication) to decrease from its maximum concentration ( Cmax) to half of Cmax in the bl ...
, the time it takes for a substance to lose half of its pharmacologic, physiologic, or radiologic activity
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Effective half-life
In pharmacokinetics, the effective half-life is the rate of accumulation or elimination of a biochemical or pharmacological substance in an organism; it is the analogue of biological half-life when the kinetics are governed by multiple independent ...
, the effective radioactive half-life in organisms after accounting for excretion
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