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Time for exponential decay to remove half of a quantity
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
Half-life
2004 video game
Half-Life 2 is a 2004 first-person shooter (FPS) game developed and published by Valve Corporation. It was published for Windows on Valve's digital distribution
Half-Life_2
1998 video game
Half-Life is a 1998 first-person shooter (FPS) game developed by Valve Corporation and published by Sierra Studios for Windows. It was Valve's debut product
Half-Life_(video_game)
Video game series
Half-Life is a series of first-person shooter games created by Valve. The games combine shooting combat, puzzles and storytelling, and are played entirely
Half-Life_(series)
2020 video game
Half-Life: Alyx is a 2020 virtual reality (VR) first-person shooter game developed and published by Valve. It was released for Windows on March 23, 2020
Half-Life:_Alyx
Time taken for a drug to halve its concentration in blood plasma
Biological half-life (elimination half-life, pharmacological half-life) is the time taken for the concentration of a biological substance, such as a medication
Biological_half-life
Topics referred to by the same term
Half-life is a mathematical and scientific description of exponential or gradual decay. Half-life, half life or halflife may also refer to: Half-Life
Half-life_(disambiguation)
Alien empire from the Half-Life video game series
They are encountered throughout Half-Life 2, Half-Life 2: Episode One, and Half-Life 2: Episode Two, as well as Half-Life: Alyx, as hostile non-player characters
Combine_(Half-Life)
Video game engine
GoldSrc (pronounced "gold source", formerly the Half-Life Engine) is a proprietary game engine developed by Valve. At its core, GoldSrc is a heavily modified
GoldSrc
Unreleased video games
Half-Life is a series of first-person shooter games created and published by Valve. Since the release of the original Half-Life for Windows in 1998, several
Unreleased_Half-Life_games
This is a list of characters in the Half-Life videogame series, which comprises Half-Life, Half-Life 2, Half-Life: Alyx, and their respective expansion
Characters of the Half-Life series
Characters_of_the_Half-Life_series
2000 first-person shooter video game
Counter-Strike (also known as Half-Life: Counter-Strike or Counter-Strike 1.6) is a 2000 tactical first-person shooter game developed by Valve Corporation
Counter-Strike_(video_game)
ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between
List of radioactive nuclides by half-life
List_of_radioactive_nuclides_by_half-life
2007 video game
Half-Life 2: Episode Two is a 2007 first-person shooter game developed and published by Valve. Following Episode One (2006), it is the second of two episodic
Half-Life_2:_Episode_Two
Topics referred to by the same term
Half a Life may refer to: Half a Life (Bulychev), a 1973 novel by Kir Bulychev Half a Life (short story collection), a 1977 collection of translations
Half_a_Life
2001 video game expansion-pack
Half-Life: Decay is a multiplayer-only expansion pack for Valve's first-person shooter Half-Life. Developed by Gearbox Software and published by Sierra
Half-Life:_Decay
1999 video game
Half-Life: Opposing Force is an expansion pack for the first-person shooter game Half-Life (1998). It was developed by Gearbox Software and published by
Half-Life:_Opposing_Force
2008 American movie by Jennifer Phang
Half-Life is a 2008 American science fiction drama film directed by Jennifer Phang, starring Sanoe Lake, Julia Nickson-Soul, Leonardo Nam, Ben Redgrave
Half-Life_(film)
Metric measuring the decay of knowledge
The half-life of knowledge or half-life of facts is the amount of time that has to elapse before half of the knowledge or facts in a particular area is
Half-life_of_knowledge
2006 video game
Half-Life 2: Episode One is a 2006 first-person shooter game developed and published by Valve for Windows. It continues the story of Half-Life 2 (2004)
Half-Life_2:_Episode_One
Canceled video game
Half-Life 2: Episode Three is a canceled first-person shooter game developed by Valve. It was planned as the last in a trilogy of episodic games continuing
Half-Life_2:_Episode_Three
2001 video game
Half-Life: Blue Shift is an expansion pack for the first-person shooter video game Half-Life (1998). It was developed by Gearbox Software and published
Half-Life:_Blue_Shift
Time for all bodily mechanisms to halve a drug's concentration in the bloodstream
In pharmacokinetics, the effective half-life is the rate of accumulation or elimination of a biochemical or pharmacological substance in an organism;
Effective_half-life
1999 video game
Action Half-Life is a mod for the first-person shooter video game Half-Life. It strives to simulate action movies, especially those directed by John Woo
Action_Half-Life
Topics referred to by the same term
Half-Life VR may refer to: Half-Life: Alyx, 2020 video game Half-Life VR but the AI Is Self-Aware This disambiguation page lists articles associated with
Half-Life_VR
2012 Kenyan film
Nairobi Half Life (Swahili: Nusu Maisha ya Nairobi) is a 2012 Kenyan drama film directed by David "Tosh" Gitonga. The film was selected as the Kenyan
Nairobi_Half_Life
Video game compilation by Valve
five games developed and published by Valve. Two of the games included—Half-Life 2 and its first stand-alone expansion, Episode One—had previously been
The_Orange_Box
2005 video game
Half-Life 2: Lost Coast is an additional level for the 2004 first-person shooter game Half-Life 2. Developed by Valve, it was released on October 27,
Half-Life_2:_Lost_Coast
2020 fan web series based on Half-Life
Half-Life VR but the AI Is Self-Aware (abbreviated HLVRAI) is a 2020 improvisational machinima series based on the 1998 video game Half-Life, produced
Half-Life VR but the AI Is Self-Aware
Half-Life_VR_but_the_AI_Is_Self-Aware
Decrease in value at a rate proportional to the current value
the median life-time rather than the mean life-time.) This time is called the half-life, and often denoted by the symbol t1/2. The half-life can be written
Exponential_decay
American video game company
Bellevue, Washington. It is the developer of game franchises including Half-Life, Counter-Strike, Portal, Team Fortress, Left 4 Dead and Dota, the software
Valve_Corporation
Name of various beverages and foods made of equally mixed parts
or cream with long shelf life but must be refrigerated. In some cafés in Brussels, a "half en half", Dutch for "half and half", is a mixture of white wine
Half_and_half
Video game engine
successor to GoldSrc in 2004 with the releases of Half-Life: Source, Counter-Strike: Source, and Half-Life 2. Valve used Source in many of their games in
Source_(game_engine)
Science fiction novel by Kir Bulychev (1973)
Half a Life (Russian: Половина жизни) is a 1973 science fiction novel by Russian writer Kir Bulychev from his Doctor Pavlysh cycle. It tells the story
Half_a_Life_(Bulychev)
2004 video game
Half-Life 2: Deathmatch is a multiplayer first-person shooter video game developed by Valve. Released on Steam on November 30, 2004, it uses many of the
Half-Life_2:_Deathmatch
Bulgarian video game artist (1972–2025)
(1998), and Kingpin: Life of Crime (1999). At Valve, he worked on Counter-Strike: Source (2004), Half-Life 2 (2004), and Half-Life 2: Lost Coast (2005)
Viktor_Antonov_(artist)
Video games developed by Valve
Valve's first game was Half-Life, a first-person shooter released in 1998. It sold over nine million retail copies. Alongside Half-Life's launch, Valve released
List_of_Valve_games
2001 EP by Local H
Half-Life E.P. is an EP released by Local H in 2001. It was released as a teaser for their album Here Comes the Zoo, which included the title track. The
Half-Life_E.P.
American singer-songwriter and composer (born 1969)
more modern-sounding album which included the singles, "On A High" and "Half-Life".[citation needed] After a four-year recording break, Sheik released White
Duncan_Sheik
American television sitcom (2002–2006)
Half & Half is an American television sitcom created by Jeffrey Klarik and executive-produced by Yvette Lee Bowser through her Sister Lee Productions
Half_&_Half
the game engine created by Valve for most of their games, including Half-Life, Team Fortress 2, and Portal, as well as licensed to third parties. This
List_of_Source_mods
List of mods for Valve's first game engine
This is a list of GoldSrc mods (modifications) for the video game Half-Life (HL). Azure Sheep - A mod released in 2001 where the player controls Barney
List_of_GoldSrc_mods
Half-Life mod
Half-Life: Echoes is a modification of the first-person shooter video game Half-Life created by British developer James "MrGnang" Coburn and released on
Half-Life:_Echoes
Context-sensitive half-life or context sensitive half-time is defined as the time taken for blood plasma concentration of a drug to decline by one half after an
Context-sensitive_half-life
Central nervous system stimulant
metabolism) and age. In healthy adults, caffeine's half-life is between 3 and 7 hours. The half-life is decreased by 30–50% in adult male smokers, approximately
Caffeine
2006 British film
twice at the 2006 Toronto International Film Festival under the title The Half Life of Timofey Berezin before being distributed by HBO Films under its original
Pu-239_(film)
Chemical element with atomic number 92 (U)
Uranium radioactively decays, usually by emitting an alpha particle. The half-life of this decay varies between 159,200 and 4.5 billion years for different
Uranium
Measure of relative importance of a journal
include: Cited half-life: the median age of the articles that were cited in Journal Citation Reports each year. For example, if a journal's half-life in 2005
Impact_factor
2006 video game
of the more notable examples is Half-Life: Full Life Consequences, which is based on a fan fiction set in the Half-Life universe, penned in 2008 by a user
Garry's_Mod
1990 studio album by Either/Orchestra
The Half-Life of Desire is an album by the Either/Orchestra recorded in 1989, with one track from 1988, and released by the Accurate Records label the
The_Half-Life_of_Desire
Chemical element with atomic number 94 (Pu)
neptunium-238 (half-life 2.1 days) was synthesized, which then beta-decayed to form the new element with atomic number 94 and atomic weight 238 (half-life 88 years)
Plutonium
4-episode Machinima series
Half-Life: Full Life Consequences is a 4-episode Machinima series animated within the video game Garry's Mod and published on the video sharing website
Half-Life: Full Life Consequences
Half-Life:_Full_Life_Consequences
2017 video game
Half-Life: C.A.G.E.D. (also stylized as Half-Life: Caged) is a game modification of Half-Life by Cayle George and Future Games Select released on September
Half-Life:_C.A.G.E.D.
American video game company
executive officer. Gearbox initially created expansions for the Valve game Half-Life, then ported that game and others to console platforms. In 2005, Gearbox
Gearbox_Software
Emissions from unstable atomic nuclei
overall decay rate can be expressed as a decay constant or as a half-life. The half-lives of radioactive atoms have a huge range: from nearly instantaneous
Radioactive_decay
Peptide used as medication
a lysine residue at position 26 of Liraglutide results in an extended half-life (around 13–14 hours) in the blood. This is due to the palmitoyl chain
Peptide_therapeutics
Hypothetical particle decay process of a proton
decay via the Higgs particle, magnetic monopoles, or new X bosons with a half-life in the range 1031 to 1036 years. For comparison, the universe is roughly
Proton_decay
2007 video game
that the Combine invasion, chronologically taking place after Half-Life and before Half-Life 2, had occurred before Portal 2's events. The areas of the Enrichment
Portal_(video_game)
Chemical element with atomic number 84 (Po)
to the short half-life of all its isotopes, its natural occurrence is limited to tiny traces of the fleeting polonium-210 (with a half-life of 138 days)
Polonium
Chemical element with atomic number 118 (Og)
known isotope, oganesson-294, is highly radioactive, with a half-life of 0.7 ms. This half-life is too short for chemical studies. Because of relativistic
Oganesson
Material capable of sustaining a nuclear fission chain reaction
are usually short-lived (a notable exception is neptunium-236 with a half-life of 154,000 years) because they readily decay by beta-particle emission
Fissile_material
Video gaming website
Planet Half-Life (often abbreviated to PHL) was a gaming website owned by IGN and its subsidiary GameSpy. Maintained by a voluntary team of contributors
Planet_Half-Life
Half-Life protagonist
protagonist of the Half-Life video game series, created by Gabe Newell and designed by Marc Laidlaw of Valve. His first appearance is in Half-Life (1998). Gordon
Gordon_Freeman
2009 Canadian film
Purchase Brothers. The film is set in the Half-Life universe, during the events of Half-Life 2 and Half-Life 2: Episode One. Both films were critically acclaimed
Half-Life: Escape from City 17
Half-Life:_Escape_from_City_17
spontaneous fission, alpha decay, double beta decay, etc. with a very long half-life, but this has not yet been observed. Thus, the number of stable nuclides
List_of_nuclides
2003 video game
War II on the Western front. Originally a modification of the 1998 game Half-Life, the rights of the modification were purchased by Valve and released as
Day_of_Defeat
Benzodiazepine used for anesthesia and procedural sedation
Drawbacks include a high degree of breakthrough seizures—due to the short half-life of midazolam—in over 50% of people treated, as well as treatment failure
Midazolam
2020 video game
developed and published by Crowbar Collective. It is a fan-made remake of Half-Life (1998) in the Source game engine. Originally published as a free mod in
Black_Mesa_(video_game)
Chemical element with atomic number 74 (W)
are 181W with a half-life of 121.2 days, 185W with a half-life of 75.1 days, 188W with a half-life of 69.4 days, 178W with a half-life of 21.6 days, and
Tungsten
1992 video by Metallica
A Year and a Half in the Life of Metallica is a two-part documentary about the process of making the Metallica album (or "The Black Album") and the following
A Year and a Half in the Life of Metallica
A_Year_and_a_Half_in_the_Life_of_Metallica
2012 video game
studio Team Psykskallar. It is derived from a mod for the video game Half-Life developed by the same team a year prior. Cry of Fear follows the story
Cry_of_Fear
Chemical element with atomic number 90 (Th)
thorium isotopes are unstable. The most stable isotope, 232Th, has a half-life of 14.0 billion years, or about the age of the universe; it decays very
Thorium
Chemical element with atomic number 86 (Rn)
naturally occurring radon isotopes, only 222Rn has a sufficiently long half-life (3.825 days) for it to be released from the soil and rock where it is
Radon
stable known isotope has half-life of 471.7 days. Only tracer amounts have ever been produced. Most stable known isotope has half-life of 100.5 days. Only
Prices_of_chemical_elements
2004 novel by Aaron Krach
Half-Life is a debut novel by Aaron Krach. Published in 2004 by Alyson Books, the novel was nominated for a Violet Quill Award and was among the 2004
Half-Life_(Krach_novel)
Chemical element with atomic number 85 (At)
astatine's isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours. Consequently, a solid sample of the element has never been
Astatine
Video game engine
that same year. Other Valve games such as Artifact, Dota Underlords, Half-Life: Alyx, Counter-Strike 2, and Deadlock have been produced with the engine
Source_2
Chemical element with atomic number 72 (Hf)
the primordial 174Hf has a very long half-life of 3.8×1016 years. The extinct radionuclide 182Hf has a half-life of 8.90 million years, and is an important
Hafnium
Film actress
appeared in the 2004 film Ethan Mao and in the 2008 independent film Half-Life. Nickson is the daughter of a British father and a Chinese mother. After
Julia_Nickson
Video game monster
Headcrabs are a parasitoid alien race found in the Half-Life series of video games, originating in 1998's Half-Life. It is a creature that attacks people, trying
Headcrab
American videogame writer (born 1965)
Studios, having been involved in the story writing for series such as Half-Life, Portal, and Left 4 Dead. Faliszek first gained recognition as the co-creator
Chet_Faliszek
American businessman (born 1962)
Valve and fund the development of their first game, Half-Life (1998). After the success of Half-Life, Harrington sold his stake in Valve to Newell and left
Gabe_Newell
Radioactive isotope of caesium
discovered by Glenn T. Seaborg and Margaret Melhase. Caesium-137 has a half-life of about 30.04 years, decaying by beta emission to stable barium-137.
Caesium-137
Chemical element with atomic number 83 (Bi)
metal's only primordial isotope, bismuth-209, undergoes alpha decay with a half-life roughly a billion times longer than the estimated age of the universe
Bismuth
Chemical element with atomic number 28 (Ni)
with half-life 76,000 years, 63 Ni (100 years), and 56 Ni (6 days). All other radioisotopes have half-lives less than 60 hours and most these have half-lives
Nickel
Chemical element with atomic number 20 (Ca)
much shorter-lived than 41Ca; the most stable are 45Ca (half-life 163 days) and 47Ca (half-life 4.54 days). Isotopes lighter than 42Ca usually undergo
Calcium
Electrical generator that uses heat from radioactive decay
proportional to half-life. An isotope with twice the half-life and the same energy per decay will release power at half the rate per mole. Typical half-lives for
Radioisotope thermoelectric generator
Radioisotope_thermoelectric_generator
Benzodiazepine medication
will accumulate, since it has a longer half-life and active metabolites, these metabolites also have long half-lives. Clinical example: Diazepam has long
Lorazepam
American video game writer
games including Psychonauts (2005), Half-Life 2: Episode One (2006), Portal (2007), Portal 2 (2011) and Half-Life: Alyx (2020). As a high-school student
Erik_Wolpaw
2014 young adult novel by Sally Green
Lost (Half Life #3). Penguin Books. ISBN 978-0-670-01714-0. Retrieved 20 June 2015. {{cite book}}: |website= ignored (help) Half Lies, A Half Bad story
Half_Bad
Method for determining the age of objects
is, the less 14 C there is to be detected. The half-life of 14 C (the period of time after which half of a given sample will have decayed) is about 5
Radiocarbon_dating
Video game series by Valve
first-person puzzle-platform video games developed by Valve. Set in the Half-Life universe, the two main games in the series, Portal (2007) and Portal 2
Portal_(series)
Isotope of polonium
undergoes alpha decay to stable 206Pb with a half-life of 138.376 days (about 4+1⁄2 months), the longest half-life of all naturally occurring polonium isotopes
Polonium-210
Benzodiazepine medication
benzodiazepines due to its long half-life. Chlordiazepoxide has a medium to long half-life, while its active metabolite has a very long half-life. The drug has amnesic
Chlordiazepoxide
Red pigment of the bile
takes about 12–14 days (equivalent to the half-life of albumin) in contrast to the usual 2 to 4 hours (half-life of bilirubin). Rifai, Nader; Horvath, Andrea
Bilirubin
Medication for musculoskeletal pain
elimination half-life ranges between 1 and 2 hours, and the plasma protein binding ranges between 46% and 50%. The elimination half-life was longer in
Methocarbamol
Chemical substance not composed of simpler ones
electronegativity. The radioactive nuclides can be arranged by length of half-life. As substances, the properties of chemical elements include their density
Chemical_element
1998 video game
Firearms is a first-person shooter mod for Half-Life which originated from a Quake modification. Initially developed in 1998, Firearms was created as
Firearms_(video_game)
2006 novel by Shelley Jackson
Half Life is the 2006 debut novel of American writer and artist Shelley Jackson. The novel presupposes an alternate history in which the atomic bomb resulted
Half_Life_(Jackson_novel)
Medical imaging technique
to correlate with increased brain activity. Because of its two-minute half-life, oxygen-15 must be piped directly from a medical cyclotron for such uses
Positron_emission_tomography
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