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HCl acid washing is usually applied to samples destined for combustion.Because HCl reacts with carbonate to produce CO2, its use in pretreatment work is restricted to non-carbonate samples. "It ends up in crates in storage, but a lot of that is gold dust for radiocarbon dating." To determine the age of the materials, the team measured the amount of radioactive carbon-14 in each sample and used the known decay rate of carbon-14 to calculate an age. "A lot of the stuff is not is particularly beautiful," Dee said.The aim is to reduce the p H levels of the sample to a neutral level by continual rinsing.During this treatment, regular litmus readings are taken to determine the extent of the acidity remaining.
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Such calculations are not exact and produce results that represent a window of time, usually ranging between 200 to 300 years or so.
Similar types of in-depth chronologies would benefit other regions lacking such precise timelines, including Mesopotamia, said Dee.
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