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. ...
. 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...
For example, carbon-14 is constantly replenished in living organisms. All living things have the same ratio of carbon-12 to carbon-14. That ratio changes once the organism dies because the carbon-14 decays while the carbon-12 remains stable. By knowing the decay rate of carbon-14 (it has...
Watt, D.E., Ramsden, D., Wilson, H.W., 1961. The half-life of carbon-14. International Journal of Applied Radiation and Isotopes 11, 68-74.Mann WB, Marlow WF, Hughes EE. 1961. The half-life of carbon-14. International Journal of Applied Radi-...
The half life for Carbon-14 is 5730 years. Calculate the amount of time it would take 60.0g of Carbon-14 to be reduced to only 7.50There are 2 steps to solve this one. Solution 100% (3 ratings) Share Step 1 Formula f...
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 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...
At one half-life, you would have approximately 50% Carbon-14 and 50% Nitrogen-14. In other 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% Car...
What else can you tell me about the half life of atoms? 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...