Radioactive dating archeology
The most important archaeological dating method is radiocarbon dating.It is a technique that can yield absolute dates with accuracy up to approximately 5000 years before present.These atoms rapidly decay into radiocarbon-dioxide and along with ordinary CO2 are absorbed by living plants.As plants enter the human and animal food chains the C14 dioxide enters their living tissue.It is based on the knowledge that living organisms build up their own organic matter by photosynthesis or by using atmospheric carbon dioxide.
By measuring the remaining 14C in a sample of excavated material, a calendar date could therefore be ascribed to it.
First, the half-life of 14C is actually 5,730 years, and second, he believed that the carbon content of the atmosphere was constant, whereas it is now known that atmospheric carbon levels have varied somewhat over time.
That is why radiocarbon dates are now ‘calibrated’ using a tree-ring calibration curve.
Tree-ring dates are precise to a single year, and dendro-samples can also be radiocarbon dated, allowing 14C measurements to be correlated with calendar dates.
LONDON, ENGLAND—Radiocarbon dating of a minute sample of the Tarkhan Dress, an ancient Egyptian linen shirt, has confirmed that it is the oldest known woven garment, having been made between 34 B. Originally excavated in 1913 from a First Dynasty tomb at the Tarkhan necropolis south of Cairo, the dress’s dimensions indicate it was made for a teenager or slim woman.