Effective range of carbon dating

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What methods do they use and how do these methods work?

A huge amount of work is currently underway to extend and improve the calibration curve.

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

Tree rings can be counted and their radiocarbon content measured.

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.

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