Dating techniques in anthropology Webcams dating

Chronometric dating, also known as chronometry or absolute dating, is any archaeological dating method that gives a result in calendar years before the present time.Archaeologists and scientists use absolute dating methods on samples ranging from prehistoric fossils to artifacts from relatively recent history.By measuring the carbon-14 in organic material, scientists can determine the date of death of the organic matter in an artifact or ecofact.The relatively short half-life of carbon-14, 5,730 years, makes dating reliable only up to about 50,000 years.

Carbon-14 moves up the food chain as animals eat plants and as predators eat other animals. It takes 5,730 years for half the carbon-14 to change to nitrogen; this is the half-life of carbon-14.Other radiometric dating techniques are available for earlier periods.One of the most widely used is potassium–argon dating (K–Ar dating).In archaeology, absolute dating is usually based on the physical, chemical, and life properties of the materials of artifacts, buildings, or other items that have been modified by humans and by historical associations with materials with known dates (coins and written history).Techniques include tree rings in timbers, radiocarbon dating of wood or bones, and trapped-charge dating methods such as thermoluminescence dating of glazed ceramics.

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