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In addition, samples need to be thoroughly cleaned to remove carbon contamination from glues and soil before dating.

This is particularly important for very old samples.

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 calibrated date is also presented, either in BC or AD or with the unit cal BP (calibrated before present - before 1950).

The calibrated date is our “best estimate” of the sample’s actual age, but we need to be able to return to old dates and recalibrate them because new research is continually used to update the calibration curve.

The total mass of the isotope is indicated by the numerical superscript.

The barbarians of the north were capable of designing complex structures similar to those in the classical world.

Professor Willard Libby produced the first radiocarbon dates in 1949 and was later awarded the Nobel Prize for his efforts.

Radiocarbon dating works by comparing the three different isotopes of carbon.

Luckily, we can measure these fluctuations in samples that are dated by other methods.

Tree rings can be counted and their radiocarbon content measured.

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