1 : the time required for half of something to undergo a process: as a : the time required for half of the atoms of a radioactive substance to become disintegrated b : the time required for half the amount of a substance (as a drug or radioactive tracer) in or introduced into a living system or ecosystem to be eliminated or disintegrated by natural processes
2 : a period of usefulness or popularity preceding decline or obsolescence <slang usually has a short half-life>
2 : a period of usefulness or popularity preceding decline or obsolescence <slang usually has a short half-life>
For americium-241, it is known that half of the atoms decay in 458 years. Therefore, 458 years is the half-life of americium-241. Every radioactive element has a different half-life, ranging from fractions of a second to millions of years, depending on the specific isotope. For example, americium-243 has a half-life of 7,370 years.
by Mark January 6, 2004
Get the Half Lifemug. Half-Life is a revolutionary game for computer; more need not be said.
An element's half life is the period of time it takes for half of the radioactive isotopes to decay. It is ibnot/b/i used to describe the dissapation of something not radioactive(subliminal hintcaffeine for instance /subliminal hint)
An element's half life is the period of time it takes for half of the radioactive isotopes to decay. It is ibnot/b/i used to describe the dissapation of something not radioactive(subliminal hintcaffeine for instance /subliminal hint)
Random_Gaming_Publication: And our game of the year award goes to... Half-Life
The_rest_of_the_word: ... really? *yawn*
Random_Chem_1_teacher: The radioactive half-life of carbon60 is approximately 6000 years.
The_rest_of_the_word: ... really? *yawn*
Random_Chem_1_teacher: The radioactive half-life of carbon60 is approximately 6000 years.
by opium April 30, 2003
Get the half lifemug. 1. The length of time needed for half the atoms of a radioactive isotope sample to decay
2. A sweet game
2. A sweet game
by Kupo December 21, 2004
Get the Half-Lifemug. A very good computer game that gets abused by HALO zombies. Basic single player owns. Got lots of addictive mods.
by Gungsta-Pasta August 4, 2003
Get the Half-Lifemug. One of the most addictive games after Counter-strike and World of warcraft.most of the players are individuals from 5 years to 25 years old and are those who play up to 8 hours a day are called ironiclly "half-lifers" because they have a"half-life" by playing that long.
Dude 1: hey what are you doing?
Dude2:nothing, playing half-life
Dude 1: how long?
Dude 2: 9 HOURS STRAIGHT
Dude 1: you such a half-lifer
Dude2:nothing, playing half-life
Dude 1: how long?
Dude 2: 9 HOURS STRAIGHT
Dude 1: you such a half-lifer
by miles949 July 5, 2009
Get the HALF-LIFEmug. by captain bernard August 18, 2008
Get the half lifemug. It was awarded "Game of the Year" by over 50 publications for its debut in 1999.
I need not say more then this;
NO GAME WILL BEAT THE TITLE SAID BELOW!!
I need not say more then this;
NO GAME WILL BEAT THE TITLE SAID BELOW!!
"Best Game of All Time" - PC Gamer
Half-Life was named "Best Game of All Time" by PC Gamer magazine in its November, 1999 issue.
Half-Life was named "Best Game of All Time" by PC Gamer magazine in its November, 1999 issue.
by XxKenjiYamaguchi July 6, 2004
Get the Half-Lifemug.