Limitations edit The relatively short half-life of carbon-14, 5,730 years, makes dating reliable only up to about 50,000 years. The technique often cannot pinpoint the date of an archeological site better than historic records, but is highly effective for precise.
Thus dating that particular tree does not necessarily indicate when the fire burned or the structure was built. For this reason, many archaeologists prefer to use samples from short-lived plants for radiocarbon dating.
Optically stimulated luminescence (OSL) edit Optically stimulated luminescence (OSL) dating constrains the time at which sediment was last exposed to light. During sediment transport, exposure to sunlight zeros the luminescence signal.
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One of the most widely used is potassiumargon dating (KAr dating ). Potassium-40 is a radioactive isotope of potassium that decays into argon-40. The half-life of potassium-40 is 1.3 billion years, far longer than that of carbon-14, allowing much older.
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