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Theoretically, the AMS instrument should obtain ages up to 95,000 years, but practically, 60,000 years or less is the limit.

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Scientists use a technique called radiometric dating to estimate the ages of rocks, fossils, and the earth.

The amount of carbon-14 in the air has stayed the same for thousands of years.

There is a small amount of radioactive carbon-14 in all living organisms because it enters the food chain.

This is due to the fact that the AMS instrument has to be calibrated, and yet the organic materials used for calibration (that are supposed to be so old they shouldn't have any detectable radiocarbon left in them) all contain so much radiocarbon that it means samples of unknown age can't yield dates above this radiocarbon barrier.

The other factor is what has become known as the "radiocarbon barrier" at around 55,000–60,000 years.




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