This dating method is also known as Archaeological Dating or Historical Chronology. These methods were relied on especially prior to the introduction of scientific methods of dating.
But, even when the scientific methods of absolute dating are available, this method of dating has not lost its importance, as many a time we have to depend solely on relative dating.
Radiometric dating is a method of dating based on the rate of decay of radioactive isotopes present in all organic materials.
The radiometric dating technique used most widely in archaeology is radiocarbon, or C-14, dating.
with a standard deviation of plus or minus 120 years, the chances are two in three that that sample dates from between 1120 and 880 BC.
Here's how: Calculations based on one standard deviation of 120 years: 1000 120 = 1120 BC (Oldest date) 1000 - 120 = 880 BC (Most recent date) To increase the range of possible dates of a sample, archeologists may calculate the radiocarbon date to two standard deviations.Radiocarbon dating is a widely applied absolute dating method in archeology.It is based on the knowledge that living organisms build up their own organic matter by photosynthesis or by using atmospheric carbon dioxide.For example, beads closely resembling those from the temple repositories at Cnoss and dating from C.1600 B.C were found in a late context (Period V) at Harappa. By noting the association of these beads it has been possible to trace a archaeological datum line across Indian sub-continent and Mesopotamia.Radiocarbon dates are usually calculated to one standard deviation.For example, if a sample is tested and given a radiocarbon date of 1000 BC.Once a type has been classified by the aid of its context further specimen of the same type, even when found in isolation, can be assigned their place in terms of dates.Association in simplicity can be illustrated by an example, at the port of Arikamedu near Pondicherry.Any item that derives from a previously living organism—for example, a basket made of plant fibers or a scrap of animal hide—can be subjected to carbon-14 dating.The technique is useful for dating items up to about 50,000 years old.