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Measuring carbon-14 in bones or a piece of wood provides an accurate date, but only within a limited range.

But to use any trapped charge method, experts first need to calculate the rate at which the electrons were trapped.

It would be like having a watch that told you day and night.” Single crystal fusion: Also called single crystal argon or argon-argon (Ar-Ar) dating, this method is a refinement of an older approach known as potassium-argon (K-Ar) dating, which is still sometimes used.

Both methods date rock instead of organic material. But unlike radiocarbon dating, the older the sample, the more accurate the dating — researchers typically use these methods on finds at least 500,000 years old.

This includes factoring in many variables, such as the amount of radiation the object was exposed to each year.

These techniques are accurate only for material ranging from a few thousand to 500,000 years old — some researchers argue the accuracy diminishes significantly after 100,000 years.

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