Carbon dating method reliable
Carbon-14 has a half-life of 5,730 ± 40 years—, half the amount of the radioisotope present at any given time will undergo spontaneous disintegration during the succeeding 5,730 years. It has proved to be a versatile technique of dating fossils and archaeological specimens from 500 to 50,000 years old.Because carbon-14 decays at this constant rate, an estimate of the date at which an organism died can be made by measuring the amount of its residual radiocarbon. The method is widely used by Pleistocene geologists, anthropologists, archaeologists, and investigators in related fields.Carbon-14 is continually formed in nature by the interaction of neutrons with nitrogen-14 in the Earth’s atmosphere; the neutrons required for this reaction are produced by cosmic rays interacting with the atmosphere.Radiocarbon present in molecules of atmospheric carbon dioxide enters the biological carbon cycle: it is absorbed from the air by green plants and then passed on to animals through the food chain.Once you heat this item again using high temperatures, the trapped electrons become excited and recombine with the item’s material.This process frees energy in the form of light, which can be measured.
Based on a discipline of geology called stratigraphy, rock layers are used to decipher the sequence of historical geological events.
This method includes carbon dating and thermoluminescence.
The absolute dating method first appeared in 1907 with Lord Rutherford and Professor Boltwood at Yale University, but wasn’t accepted until the 1950s.
It is the only method that can be used to date rocks, pottery and minerals for dates that are approximately between 300 to 10,000 years old.
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.
Archaeologists are seeking an accurate dating technique, but this method is yet to be found.