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15-Jun-2020 12:03

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This is a radiometric technique since it is based on radioactive decay.Cosmic radiation entering the earth’s atmosphere produces carbon-14, and plants take in carbon-14 as they fix carbon dioxide.Argon, a noble gas, is not commonly incorporated into such samples except when produced in situ through radioactive decay.The date measured reveals the last time that the object was heated past the closure temperature at which the trapped argon can escape the lattice.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.

This light can be measured to determine the last time the item was heated. Fluctuating levels can skew results – for example, if an item went through several high radiation eras, thermoluminescence will return an older date for the item.K–Ar dating was used to calibrate the geomagnetic polarity time scale.

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