Carbon dating maximum age
This method requires less than 1g of bone, but few countries can afford more than one or two AMSs, which cost more than A0,000.
Australia has two machines dedicated to radiocarbon analysis, and they are out of reach for much of the developing world.
The uncalibrated date is given with the unit BP (radiocarbon years before 1950).
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View the full list Radiocarbon dating has transformed our understanding of the past 50,000 years.
In this way large domed tombs (known as tholos or beehive tombs) in Greece were thought to predate similar structures in the Scottish Island of Maeshowe.
This supported the idea that the classical worlds of Greece and Rome were at the centre of all innovations.
Luckily, we can measure these fluctuations in samples that are dated by other methods.