Half life - Factbites

Half life - Factbites
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Topic: Half life

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	Half-life - Wikipedia, the free encyclopedia
		The half-life of a quantity subject to exponential decay is the time required for the quantity to fall to half of its initial value.
		is the half life of the second process.
		Look up half-life in Wiktionary, the free dictionary.
	en.wikipedia.org /wiki/Half-life (317 words)

	Radioactive Half-Life (cont.)
		Therefore, after one half-life, you would have 5 grams of Barium-139, and 5 grams of Lanthanum-139.
		After one half-life of a given radioisotope, only one half as much of the original number of atoms remains active.
		The energy of the radiation for a given isotope is considered to be constant for the life of the isotope.
	www.ndt-ed.org /EducationResources/HighSchool/Radiography/halflife2.htm (501 words)

	Halflife
		The halflife is the amount of time it takes for half of the atoms in a sample to decay.
		The halflife for a given isotope is always the same ; it doesn't depend on how many atoms you have or on how long they've been sitting around.
		The halflife is always the same, but the half gets smaller and smaller.
	www.colorado.edu /physics/2000/isotopes/radioactive_decay3.html (300 words)

	Radioactive Half-Life
		The radioactive half-life for a given radioisotope is the time for half the radioactive nuclei in any sample to undergo radioactive decay.
		The radioactive half-life gives a pattern of reduction to half in any successive half-life period.
		After two half-lives, there will be one fourth the original sample, after three half-lives one eight the original sample, and so forth.
	hyperphysics.phy-astr.gsu.edu /hbase/nuclear/halfli.html#c1 (59 words)

	Half Life Questions -- Page 2 of 17
		Each division on the slider represents one half-life, which is the amount of time required for one-half of a given amount of parent isotopes to decay.
		Half Life Questions -- Page 2 of 17
		The red and blue curves represent the changing amounts of parent and daughter isotopes, respectively.
	www.sciencecourseware.org /VirtualDating/files/2.0_HalfLife.html (175 words)

	Gargantua (Half-Life) - Wikipedia, the free encyclopedia
		Gargantuas can be seen in Half-Life in the chapters "Power Up," "Surface Tension," "Interloper," and "Nihilanth." In the Opposing Force expansion, a Gargantua can be seen tied up on top of the hydroelectric dam, while marines and Race X Shock Troopers fight around and with it.
		The Gargantua, or simply "Garg" as it is commonly abbreviated, is a fictional creature from the 1998 computer game Half-Life by Valve Software.
		Gargantuas are very determined pursuers, and have been known to wait patiently for their target to come out of an area they can't reach for a considerable amount of time before moving on to do something else.
	en.wikipedia.org /wiki/Gargantua_(Half-Life) (430 words)

	Game: Half-Life 2 - Mod DB
		if you go to the half life 2 episode 1 site it explains about the Gman more.
		half life means something, it is like a romen letter or something like that
		The time required for half the quantity of a drug or other substance deposited in a living organism to be metabolized or eliminated by normal biological processes.
	games.moddb.com /61/half-life-2 (929 words)

	Amazon.co.uk: Half-Life (PS2): PC & Video Games
		Half life 2 for the PS2 has now been discounted (by Valve the developer) as a rumor put out by obsessive fans.
		'Half Life' while not being the best F.P.S. is certainly very enjoyable, and in a style which influenced 'Red Faction', the game is not divided by levels, the whole thing plays like a film.
		If Half-life, a boring scientist who lives a cool life but with no passion, becomes what we all want to be.
	www.amazon.co.uk /exec/obidos/ASIN/B00005NCEQ (1431 words)

	Glossary Item - Half-life
		The half-life describes the amount of time needed for half of a sample of unstable atoms or particles to undergo decay.
		They only know that, on average, half of a sample will decay during the span of one half-life.
		This means that half of a sample of thallium-208 will decay into lead-208 over the course of 3.05 minutes.
	education.jlab.org /glossary/halflife.html (82 words)

	GCSE Nuclear Radiation: Half life
		First finger: after one half-life (2 hours), half of the substance is left.
		If the count rate has fallen by half, then the number of unstable atoms has fallen by half.
		Second finger: after two half-lives (another 2 hours), half of that is left, so we're down to a quarter.
	www.darvill.clara.net /nucrad/hlife.htm (394 words)

	Theory: Life-Time and Half-Life
		After a second half-life interval again, one half of the remaining particles will decay, leaving 1/2*1/2 = 1/4 of the original sample.
		After three half-life intervals, 1/8 of the original particle remain, after four such intervals 1/16 remain, and so on.
		Given a large number of identical particles, the time in which half of the particles will decay is a definite interval, which is characteristic of that particular particle.
	www2.slac.stanford.edu /vvc/theory/halflife.html (333 words)

	Barnacle (Half-Life) - Wikipedia, the free encyclopedia
		Barnacles are relatively simple creatures, consisting primarily of a mouth full of sharp teeth, and a long, retractable tongue.
		Barnacles are relatively weak; a few shots from a 9mm pistol will kill them.
		Upon reaching the mouth, the object is quickly evaluated by the barnacle: objects considered edible by the barnacle are crushed and consumed, and unpalatable objects are released.
	en.wikipedia.org /wiki/Barnacle_(Half-Life) (510 words)

	Barnacle - Wikipedia, the free encyclopedia
		Barnacles were first fully studied and classified by Charles Darwin, as a suggestion of his friend Joseph Dalton Hooker, in his quest for understanding his ongoining development of the theory of evolution and natural selection.
		A barnacle is a type of arthropod belonging to infraclass Cirripedia in the subphylum Crustacea and is hence distantly related to crabs and lobsters.
		Since barnacles are seafood, the Barnacle Goose was counted as a fish, and could be eaten by Catholics on Fridays, when meat used to be forbidden.
	www.wikipedia.org /wiki/Barnacle (436 words)

	Xen - Valve Developer Community
		Half-Life ends with the player travelling to Xen and defeating the Nihilanth.
		Xen is the native home of various organisms such as the headcrab, the barnacle, and the vortigaunt (aka Alien Slave).
		Xen was often criticised for its frustrating "jumping puzzles" - jumping from platform to platform, or jumping off of giant manta-rays, etc. Therefore, it is best to relegate moving platforms to an atmospheric role rather than a gameplay mechanic.
	developer.valvesoftware.com /wiki/Xen (303 words)

	Xen (Half-Life) - Wikipedia, the free encyclopedia
		Xen's leader, Nihilanth, is ultimately destroyed by Freeman to put an end to the invasion of Earth, allowing the United States military and the G-Man to invade and seize control of Xen.
		However, given that Xen is comprised of low mass asteroids, it is surprising that there is any appreciable gravitational pull at all, let alone a sufficiently strong pull to retain the breathable atmosphere encountered there.
		The Xen asteroids are home to a wide variety of different plant and animal species, forming a complex ecosystem.
	en.wikipedia.org /wiki/Xen_(Half-Life) (1678 words)

	Radionuclide Half-Life Measurements Made at NIST
		Values revised since NBS Special Publication 626 for the half lives of various "short-lived" radionuclides arise from improved impurity analysis, incorporation of additional data from new sources, and reevaluation of old data.
		The half lives of many radionuclides have been measured in the Radioactivity Group of NIST.
		by M.P. Unterweger, D.D. Hoppes, and F.J. Schima (1992), is a revised listing of the half lives determined at NIST since 1967.
	physics.nist.gov /PhysRefData/Halflife/halflife.html (235 words)

	RADIOACTIVITY: HALF-LIFE
		The radioactive half-life of the substance is the period of time over which the number of radioactive nuclei decreases by a factor of one-half.
		Radioactive Half-Life: A period of time in which half the nuclei of a species of radioactive substance would decay.
		Hence, as time goes on, we know that the number of radioactive nuclei in the substance must also be decreasing.
	einstein.byu.edu /~masong/HTMstuff/C24A1.html (278 words)

	Halflife2.net
		Oh, fine: Episode One is a continuation of the Half-Life 2 story out on the 1st June for $19.95 and packaged with Half Life Death Match: Source, and HL2DM.
		He's close, you know it – the battle for 617's life is about to erupt into motion.
		The next few seconds will decide your life.
	www.halflife2.net (2113 words)

	HalfLife Website Directory
		The term half-life refers to the period of time that a property of a substance degrades to half of its value.
		If you missed out on Half-Life, fear not, as the story line is straightforward enough—at least in the beginning.
		You'll combat battle-clad humans, mutant zombies, giant insects, and other unspeakable menaces with a handy crowbar, a machine gun, and notably, a gravity gun, the game's new toy that shows off Half Life 2's impressive physics.
	www.halflife.pl (543 words)

	Amazon.co.uk: Half-Life 2 (DVD ROM): PC & Video Games
		In Half Life 2 Gordon is again humanity's only hope against a whole sea of alien trouble as he joins up with another scientist Eli Vance and his daughter Alyx, in a mission is to save the world from being overrun by the Xen invaders.
		Half-Life 2 allows all this and more and could very well be the first game to actually exceed its hype, never mind just live up to it.--David Jenkins
		Half life 2 - One of the best games you will ever play, January 12, 2006
	www.amazon.co.uk /exec/obidos/ASIN/B00009ATWC (1322 words)

	AVault PC Half-Life Review
		Still, the scientist-turned-savior is having the time of his life.
		He's been chastised by his fellow scientists, shot at by the military, terrorized by hideous inter-dimensional monsters, and recruited for a suicide mission to save the planet Earth.
		Because he's the lead character in the hottest first-person shooter since Doom, and after this nightmare ends even Lara Croft will be knocking on his door.
	www.avault.com /reviews/review_temp.asp?game=half&page=1 (683 words)

	PriceGrabber.com - Comparison Shopping Beyond Compare
		Playstation 2, Xbox, Game Cube, Game Boy Adv, More...
	www.pricegrabber.com (683 words)

	Encyclopedia: Half Life 2
		Half life is also important in calculating populations, although it is only applicable where the resources available to the population remain surplus to the needs.
		The Stunstick is present at the beginning of Half Life 2, and inflicts no damage initially, although it alters the player's view temporarily—causing it to wobble and go red.
		The half-life of a radioactive isotope is the time it takes for half of the atoms in a pure sample of the isotope to decay into another element.
	www.nationmaster.com /encyclopedia/Half_Life-2 (5211 words)

	Half-Life 2 - Wikipedia, the free encyclopedia
		The environments in Half-Life 2 are varied, ranging from the Eastern European-styled City 17 and surrounding areas, to the massive Combine citadel.
		Antonov wrote that Eastern Europe was favored as a setting for the game as it is capable of depicting a combination of both new and old architecture, creating a city with history; "gothic themes associated with Prague and vampires" were also overlooked in favor of a different aspect of the region.
		Many of the weapons featured in Half-Life 2 are carried over from Half-Life, including the crowbar for mêlée fighting, the conventional firearms of the SPAS-12 shotgun,.357 Magnum revolver, crossbow, and rocket propelled grenade launcher as well as the Gauss Gun experimental particle weapon.
	en.wikipedia.org /wiki/Half-Life_2 (5870 words)

	Half-Life - Wikipedia, the free encyclopedia
		With even a half decent port, Sega would have been able to attract new players to their cult console.
		Xen — On the strange borderworld, Gordon encounters many of the aliens that had been brought into Black Mesa, as well as the remains of HEV-wearing researchers that came before him.
		As Freeman tries to make his way out of the ruined facility to find help for the injured, he soon discovers he is caught between two sides: the hostile aliens, and the Hazardous Environment Combat Unit, a military force dispatched to cover up the incident — including eliminating Freeman and the rest of the scientists.
	en.wikipedia.org /wiki/Half-Life (4407 words)

	Ricochet (Half-Life) - Open Encyclopedia
		Ricochet is a multiplayer mod of the popular first-person shooter, Half-Life.
		Unlike in other Half-Life mods, the number of player deaths is not shown on the scoreboard, only the number of kill points.
		There are also horizontal barriers which the disks can bounce off (hence the name Ricochet); a direct hit resulting in a fall scores 1 point, a single-bounced hit scores 2 points, double-bounced 3 points, and so on.
	open-encyclopedia.com /Ricochet_(Half-Life) (206 words)

	Experiment #6: Half-Life
		Below is a graph showing the half life of the isotope, Americium-241.
		This document was produced by the Nuclear Science Division of the Lawrence Berkeley National Laboratory.
		Note that in theory, some of the original substance will always remain as the amount of substance only reaches zero as time approaches infinity.
	www.lbl.gov /abc/experiments/Experiment6.html (872 words)

	Half-Life Fallout - Up-to-the-minute coverage of Half-Life 2
		Also expected to appear at the E3 event are real life versions of the game's lead female roles, Elexis Sinclaire and Jessica Cannon.
		The minute and a half video contains a compilation of footage some new and old.
		The winner of the contest will be rewarded with the beautiful rig shown to the right.
	www.hlfallout.net (863 words)

	Today @ PC World - Half Life 2 Rocks
		Half Life 2 is a beautiful game, with tons of eye candy, solvable puzzles, and an engrossing storyline.
		I don't get the chance to play a lot of PC games, but when it became clear that Valve/Sierra/Vivendi Universal was--after numerous tortuous delays--really going to launch Half Life 2 last week, I decided it was time for me to spend a little quality time with my pistol-packing alter ego, Gordon Freeman.
		If you are looking at Half Life 2 dont sit there go buy it!If you think any other game i.e.
	blogs.pcworld.com /staffblog/archives/000324.html (2834 words)

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In the News (Wed 11 Nov 09)