Different types dating techniques used archaeology
Specimens of organic material which can yield good amount of carbon can be collected for C-14 dating.For example charcoal, wood, shell, paper, leaves, cloth, animal hair, bone, pollen, tooth, iron, prehistoric soot from the ceiling of the caves practically any material containing some carbon can be subjected Bones are generally affected by ground water carbonates and are therefore least reliable for dating.Basing on this principle, the cultural assemblages found in different layers can be assigned a chronological personality. In practice it is found that the mounds are disturbed9 by all sorts of pits and dumps.
Association in simplicity can be illustrated by an example, at the port of Arikamedu near Pondicherry.Sir Flinders Petrie had worked out a formula for dating the finds on the basis of the thickness of the deposit.According to him a period of hundred years may be granted for the accumulation of a deposit of one and a half feet.The quantity of the C-14 remaining is measured by counting the beta radiation emitted per minute per gram of material.
Modern C-14 emits about 15 counts per minute per gram, whereas Carbon-14 which is 5700 years old, emits about 7.5 counts per minute per gram.Charred bones are better preserved and are therefore relatively more reliable.