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Carbon14 (C14), a radioactive isotope of carbon, is produced in the upper atmosphere by cosmic radiation.
The primary carboncontaining compound in the atmosphere is carbon dioxide, and a very small amount of carbon dioxide contains C14.
This has to do with figuring out the age of ancient things.
If you could watch a single atom of a radioactive isotope, U238, for example, you wouldn’t be able to predict when that particular atom might decay.
After one halflife passes, half of the remaining nuclei will decay in the next halflife.
Then, half of that amount in turn decays in the following halflife.
Here we will explore halflife and activity, the quantitative terms for lifetime and rate of decay. The answer can be found by examining Figure 22.27, which shows how the number of radioactive nuclei in a sample decreases with time.
The time in which half of the original number of nuclei decay is defined as the .
Plants absorb C14 during photosynthesis, so C14 is incorporated into the cellular structure of plants.
Plants are then eaten by animals, making C14 a part of the cellular structure of all living things.
Comments Carbon dating formula explained
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