Radiocarbon dating world history
Carbon-14 has a half-life of 5,730 ± 40 years, meaning that every 5,700 years or so the object loses half its carbon-14.
Samples from the past 70,000 years made of wood, charcoal, peat, bone, antler or one of many other carbonates may be dated using this technique.
The Issue of Contamination by Synthetic Resins in Radiocarbon Dating: The Case of a Painting by Ambrogio Lorenzetti.
Caforio, Lucia Fedi, Mariaelena Liccioli, Lucia and Salvini, Antonella 2013.
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.
Carbon-14 is also passed onto the animals that eat those plants.
After death the amount of carbon-14 in the organic specimen decreases very regularly as the molecules decay.
In 1949, Willard Libby proposed carbon dating, a method for dating carbon-containing objects (like wood, leather, or cloth) that exploits the radioactive decay of carbon-14.
The diagram above [redrawn from ] shows the decay curve for carbon-14, together with some comparison samples Libby used (including wood dated by tree rings and items from the tomb of Pharaoh Zoser, for whom the first of the pyramids was built). Later tests of carbon-dating have used dendrochronology back to about 10,000 BC.