Dictionary definition radiocarbon dating
He first noted that the cells of all living things contain atoms taken in from the organism's environment, including carbon; all organic compounds contain carbon.
When plants fix atmospheric carbon dioxide ( allows the age of the sample to be estimated.
In living organisms, which are always taking in carbon, the levels of carbon 14 likewise stay constant.
But in a dead organism, no new carbon is coming in, and its carbon 14 gradually begins to decay.
When they're hidden tree stand height BELOW the surface ...
These examples are from the Cambridge English Corpus and from sources on the web.