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Of course, the carbon-14 is radioactive and decays away slowly.

What this means is that there is an approximately constant fraction of the carbon in the world which is this radioactive carbon.

Most radiocarbon dating labs have liquid scintillation counters for radiometric dating and accelerator mass spectrometers for AMS dating.

Radiocarbon dating cannot be used to date objects over 50,000 years old because after this much time has passed a large proportion of the carbon-14 has decayed and the amount remaing is too little for accurate measurement.

At the extreme limit of dating, going back about 5000 years, you get uncertainties spanning a few hundred years, but this is still often able to get it in the 5% regime.

When something dies its 14C begins to decay away and by measuring how much 14C is left in some dead thing (either by counting the decay rate with a Geiger counter or running it through a mass-spectrometer) we can measure how long ago it died. Basically, 14C has a half-life of about 5,730 years.Radiocarbon dating seeks to age fossils based on half lives of radioactive elements, while thermoluminescence is a form of luminescence that occurs when previously absorbed energy from is remitted as light upon heating of the material.Only by liars, or by people who have been lied too.Actually, there's a very good way to check this- tree rings.Tree rings offer thousands of years of data, neatly organized, which can be averaged over many trees, to obtain a very good calibration of the amount of C14 in the atmopshere.

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