Fifty years of obsidian hydration dating in archaeology
Fifty years of obsidian hydration dating in archaeology - north american dating culture
Contaminants must not be introduced to the samples during collection and storing.Hydrocarbons, glue, biocides, polyethylene glycol, or polyvinylacetate must not come in contact with samples for radiocarbon dating.
Archaeologists, on the other hand, provide proof of authenticity of a certain artifact or debunk historical or anthropological findings.
The unstable and radioactive carbon 14, called radiocarbon, is a naturally occurring isotope of the element carbon.
When a living thing dies, it stops interacting with the biosphere, and the carbon 14 in it remains unaffected by the biosphere but will naturally undergo decay.
The proportion of carbon 14 in the sample examined provides an indication of the time elapsed since death of the sample’s source.
Radiocarbon dating results are reported in uncalibrated years BP (Before Present), where BP is defined as AD 1950.
Laboratories have limitations in terms of the samples they can process for radiocarbon dating. Laboratories must also be consulted as to the required amount of sample that they ideally like to process as well as their preference with certain samples for carbon dating.
Other labs accept waterlogged wood while others prefer them dry at submission.The relatively high temperature of the humid tropics accelerates weathering processes, including the hydration of obsidian, where the warm conditions can promote a measurable hydration thickness in less than fifty years.On the other hand, the aggressive weathering environment is capable of reducing the obsidian surface to make standard measurements untenable.Calibration is then done to convert BP years into calendar years.This information is then related to true historical dates.Radiocarbon dating has been around for more than 50 years and has revolutionized archaeology.