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b) Absolute These methods are based on calculating the date of artefacts in a more precise way using different attributes of materials.This method includes carbon dating and thermoluminescence.You may notice that some of our content still refers to English Heritage.We are in the process of rebranding, but in the meantime please be assured that all our content and guidance is still current.

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Relative techniques can determine the sequence of events but not the precise date of an event, making these methods unreliable.

The half-life of C is approximately 5730 years, which is too short for this method to be used to date material millions of years old.

The isotope of Potassium-40, which has a half-life of 1.25 Billion years, can be used for such long measurements.

Then Richard Leakey found a skull (called KNM-ER 1470) the KBS tuff, a skull that looked far too modern to be 3 million years old.

So Curtis and others redated the KBS tuff using selected pumice and feldspar samples, and obtained an age of 1.82 million years.

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