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half-life

The Columbia Encyclopedia, Sixth Edition
half-life measure of the average lifetime of a radioactive substance (see radioactivity ) or an unstable subatomic particle. One half-life is the time required for one half of any given quantity of the substance to decay. For example, the half-life of a particular radioactive isotope of thorium is 8 minutes. If 100 grams of the isotope are originally present, then only 50 grams will remain after 8 minutes, 25 grams after 16 minutes (2 half-lives), 12.5 grams after 24 minutes (3 half-lives), and so on. Of course the 87.5 grams that are no longer present as the original substance after 24... Read more
half-life
World Encyclopedia half-life Time taken for one-half of the nuclei in a given amount ... decay (change into another element or isotope). Only the half-life is measured because the decay is never considered to be ... great variety among different isotopes. Oxygen-20 has a half-life of 14 seconds and ... Read more
Ellen Gleditsch
Encyclopedia of World Biography ... of the first specialists. Gleditsch established the half-life of radium and aided in proving the existence of isotopes ... uranium and radium in radioactive minerals. Established Half-Life of Radium Gleditsch returned to Norway periodically ... radiochemist, she continued her study of radium's ... Read more

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"half-life" on Wikipedia

Related newspaper, magazine, and journal articles from HighBeam Research

Novel erythropoiesis-stimulating protein: An erythropoietin analogue with an extended half-life and less frequent dosing
Formulary; 1/1/2001; Joy, Melanie S; 5629 words ; ... chemotherapy. However, because of its short half-life, r-HuEPO must be administered two to ... analogue with a two- to threefold greater half-life, which permits administration once weekly ... increasing hematocrit, its relatively short half-life typically requires administration more ... Read more
Students' Beliefs About the Role of Atoms in Radioactive Decay and Half-life
Journal of Geoscience Education; 9/1/2005; Prather, Edward; 7921 words ; ... the concepts of radioactive decay and half-life are presented. However, the research ... interfere with students' understanding of how half-life is used to determine geologic time. To ... difficulties about radioactive decay and half-life stem from their inaccurate mental models ... Read more
New Half-Life full of action.
News Tribune (Tacoma, WA); 6/9/2006; 738 words ; ... Spoilers ahead! If you're not finished with Half-Life 2, or if you plan on playing the game ... of the popular first-person-shooter Half-Life games, he was at the edge of an explosion ... he would next be needed. In typical Half-Life fashion, the game left us with many ... hungry for six ... Read more
Using an authentic radioisotope to teach half-life: students use a radiation monitor, computer, and radioisotope generator in this real-time lab activity.
The Science Teacher; 12/1/2005; Liddicoat, Scott Sebranek, John; 2390 words ; ... tossing pennies as a model for teaching half-life. We perform several lab activities with radiation monitors, but our half-life lab--using an isogenerator to produce ... enables students to determine the half-life of a genuine radioisotope. [ILLUSTRATION ... Read more
BURTON'S BYTES - The best things in Half Life. . .
The Northern Echo; 11/26/2004; NIGEL BURTON; 633 words ; HALF LIFE 2. Publisher: Vivendi Universal. Format ... 35. Family friendly? Nope. THE original Half Life was one of those genre defining titles ... here comes the long awaited sequel to Half Life. Can it possibly live up to the reputation ... Read more
Whole lot of biz for Half-Life 2: 250K copies sold in first week.(Videogames)
Video Business; 11/29/2004; Chronis, George T.; 337 words ; Half-Life 2 is definitely living up to expectations ... most popular computer games of all time, Half-Life, which launched in 1998 and has sold more ... into next year. The retail box version of Half-Life 2 is available in a standard $54.99 version ... Read more
Graphics and details make `Half-Life 2' a must-see.
Detroit Free Press (Detroit, MI); 12/14/2004; 649 words ; Byline: Jim Schaefer Half-Life 2, $49.95 (bundled with Counter-Strike: Source ... latest, greatest video game. But listen, folks, Half-Life 2 is as close to real as you're going to find. At its core, Half-Life 2 is a fairly standard first-person shooter, with ... conforms to the laws of ... Read more
Half-Life 2's Real Battle; Theft, Lawsuits Made Getting It to Market A Daunting Task
The Washington Post; 11/16/2004; Mike Musgrove; 1152 words ; ... largely a reflection of how valuable the Half- Life franchise has become. The game was one ... among his team of programmers. When Half-Life became a hit, its style was quickly ... all of them owe some debt to Valve and Half-Life. The imitators have in turn put pressure ... company ... Read more
EA and Valve Team to Deliver 'Half Life' and 'Counter-Strike' Games
Wireless News; 7/22/2005; 304 words ; Wireless News 07-22-2005 EA and Valve Team to Deliver 'Half Life' and 'Counter-Strike' Games WIRELESS NEWS-July 22, 2005-EA and Valve Team to Deliver 'Half Life' and 'Counter-Strike' Games (C)2005 10Meters - http:// www.10meters.com Electronic Arts and Valve, the studio behind the ... Read more
Biological Half-life of Bromide in the Rat Depends Primarily on the Magnitude of Sodium Intake
Physiological Research; 11/1/2005; Pavelka, S; Babický, A; Vobecký, M; 2355 words ; ... proved our hypothesis that the biological half-life of bromide depends on the magnitude of ... intake of chloride. Key words Biological half-life * Bromide * Chloride * Sodium * Rat Introduction ... reabsorption (Rauws 1983). The biological half-life of bromide can be shortened ... Read more

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