Carbon 14 dating assumes that the carbon dioxide
For more information on cosmic rays and half-life, as well as the process of radioactive decay, see How Nuclear Radiation Works.The carbon-14 atoms that cosmic rays create combine with oxygen to form carbon dioxide, which plants absorb naturally and incorporate into plant fibers by photosynthesis.Carbon 14 dating assumes that the carbon dioxide on earth today has the same radioactive content as it did centuries ago.If this is true, the amount of carbon 14 absorbed by a tree that grew several centuries ago should be the same as the amount of carbon 14 absorbed by a tree growing today.
How long ago was the tree burned to make the ancient charcoal if the half-life of Carbon 14 is 5715 years?
The most well-known of all the radiometric dating methods is radiocarbon dating.
Although many people think radiocarbon is used to date rocks, it is limited to dating things that contain carbon and were once alive (fossils).
Animals and people eat plants and take in carbon-14 as well.
The ratio of normal carbon (carbon-12) to carbon-14 in the air and in all living things at any given time is nearly constant.