Accurate radiocarbon dating
The half life of carbon 14 is about 5,000 years, so it becomes increasingly difficult to detect at time much longer than this.Geologists use radiometric dating employing other elements that decay more slowly such as uranium/lead and potassium/argon for rocks, particularly very old rocks.He first demonstrated the accuracy of radiocarbon dating by accurately estimating the age of wood from an ancient Egyptian royal barge of which the age was known from historical documents.The Centre for Isotope Research (CIO) conducts radiocarbon-based research, and offers a radiocarbon dating service.The New Zealand curve is representative for the Southern Hemisphere, the Austrian curve is representative for the Northern Hemisphere. C is the radioactive one, its half-life (time it takes to reduce its radioactivity by half) is about 5,730 years.
It is mainly used by archaeologists for dating bones and wood from historical sites. If so, the official definition is "the determination of the age or date of organic matter from the relative proportions of the carbon isotopes carbon-12 and carbon-14 that it contains". Carbon 14 has a half life of 5,730 years and by checking the amount of the carbon 14 is in a fossil the can see how old it is. All living things have carbon in them; but a small amount of that carbon is radioactive. The law of conservation and mass states that matter can not be destroyed nor created.
In addition, carbon 14 decays with a half life of about 5,700 years and, even with good quality samples, dating can only go back to around 60,000 years.
To date anything older than that, scientists need to rely upon other dating methods, like relying upon other isotopes such as potassium and argon. The first one describes the process of carbon dating in general, and the second one discusses the accuracy of carbon dating.
Carbon dating (also called radiocarbon dating) is a very useful archeological tool, but it does have its limitations.
Dates derived from carbon dating aren't exact, and they always have a margin of error.