The history of radiocarbon dating
The same amount of carbon-14 is present in animals, which get their carbon by eating plants or other animals.
It is rapidly oxidized in air to form carbon dioxide and enters the global carbon cycle.
The Shroud has been carbon-dated to between 12 AD, which is consistent with its denunciation as a forgery by the Bishop of Troyes in 1389, shortly after it first appeared on the historical scene.
An age could be estimated by measuring the amount of carbon-14 present in the sample and comparing this against an internationally used reference standard.
Radiocarbon dating is now a standard tool in archaeology.
Ironically, archaeological bones are among the most difficult objects to date accurately.