During incineration, the apatite not only loses carbon but will also exchange carbon with the carbon dioxide in the pyre's atmosphere.
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According to Mokhtar, there were three shell mounds in Guar Kepah, all of which were cleared for archaeological work by the British in 1851.
“Last Friday, we sent three samples of siput cengkerang and charcoal to the Beta Analytic Radiocarbon Dating Lab in Miami, Florida.
The dating process is always designed to try to extract the carbon from a sample which is most representative of the original organism.
In general it is always better to date a properly identified single entity (such as a cereal grain or an identified bone) rather than a mixture of unidentified organic remains.
All animals in the food chain, including carnivores, get their carbon indirectly from plant material, even if it is by eating animals which themselves eat plants.
The net effect of this is that all living organisms have the same radiocarbon to stable carbon ratio as the atmosphere.For radiocarbon dating to be possible, the material must once have been part of a living organism.This means that things like stone, metal and pottery cannot usually be directly dated by this means unless there is some organic material embedded or left as a residue.Unfortunately, due to exchange mechanisms, the carbon in the apatite can be replaced by carbon with a different age.Incineration changes the crystallinity of the bone resulting in a protection against this exchange mechanism.“From the bones find, we can say the bones are from a woman, based on the teeth.