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Samples of bone from both the Archer and his companion were AMS radiocarbon dated at the Oxford Radiocarbon Accelerator Unit, University of Oxford.
Libby thus reasoned that by measuring carbon 14 levels in the remains of an organism that died long ago, one could estimate the time of its death.
This procedure of radiocarbon dating has been widely adopted and is considered accurate enough for practical use to study remains up to 50,000 years old.
The bone powder is pretreated and cleaned over about 4 days.
First, a dilute acid is used to remove the carbonate fraction of the bone, which accounts for about 75% of its entire mass.