half-life n 1.(General Physics) the time taken for half of the atoms in a radioactive material to undergo decay. Symbol:τ 2.(Biology) the time required for half of a quantity of radioactive material absorbed by a living tissue or organism to be naturally eliminated (biological half-life...
half-life (haf'līf), The period in which the radioactivity or number of atoms of a radioactive substance decreases by half; similarly applied to any substance, such as a drug in serum, whose quantity decreases exponentially with time. Compare:half-time. ...
half′-life` orhalf′ life`, n.,pl.-lives(-ˌlaɪvz) 1.the time required for one half the atoms of a given amount of a radioactive substance to decay. 2.the time required for the activity of a substance taken into the body to lose one half its initial effectiveness. ...
The half-life of a radioactive isotope is the average amount of time it takes about one-half of the atoms in a sample of radioisotope to decay. Different radioisotopes decay at different rates and can have wildly differing half-lives; these half-lives can be as short as a few microseconds...
. Since uranium-238 has a half-life of 4.5 billion years, it takes that amount of time for half of the original uranium-238 to decay into lead-206. In a sample of rock that does not contain appreciable amounts of lead-208, the most abundant isotope of lead, we can assume that...
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The half-life of carbon-14 is known to be 5,730 years, so we can use the half-life formula to calculate the elapsed time, or age of the material. Half-Life Formula for Time Elapsed By rearranging the half-life formula, we can solve for the amount of time elapsed by comparing the ...
Half-lives range from fractions of a second to billions of years. For example, Carbon-14 (C-14), a naturally occurring radionuclide, has a half-life of 5,730 years. After this amount of time passes, half of the initial amount of C-14 is present. Therefore, if you began with two (...
words, half (50%) of the Carbon-14 you started with has decayed into the daughter isotope Nitrogen-14. However, your readout from your radioactivity measuring instrument says you have only 25% Carbon-14 and 75% Nitrogen-14, so your fossil must have been through more than one half-life....
Half-lives of the Tz=1/2 series nuclei, 81Zr and 85Mo The nuclei 81 Zr and 85 Mo with T z =1/2 have been reinvestigated via their β-delayed proton emissions with p -γ coincidence measurement. The half-life o... WX Huang,XJ Xu,SW Xu,... - 《Zeitschrift Fur Physik A》 被...