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This process frees energy in the form of light, which can be measured.

By making multiple measurements (you need at least two for a date estimate) we can find out how much radiation the item was exposed to over the years and can get dating estimates related to when the item was last heated.

Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site.

Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating.

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.

This method is based on the fact that when a material is heated or exposed to sunlight, electrons are released and some of them are trapped inside the item.

Once you heat this item again using high temperatures, the trapped electrons become excited and recombine with the item’s material.

Stratigraphy is based on the law of superposition--like a layer cake, the lowest layers must have been formed first.Based on a discipline of geology called stratigraphy, rock layers are used to decipher the sequence of historical geological events.Relative techniques can determine the sequence of events but not the precise date of an event, making these methods unreliable.Read More Egyptian hieroglyphs are among the oldest writing systems in the world, dating back some 5,200 years.Known in ancient Egyptian as the “language of the gods” and said to have been created by the god...

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