Marking the radiocarbon revolution, the carbon dating method has been instrumental in archaeology & paleontology in dating ancient artifacts.
Prior to the 20th century, estimating the age of ancient fossils or artifacts was considered a job of a paleontologist or archaeologist. The age of silt layers or rocks was found which served as a reference to the estimate the age of an artifact or a fossil. Although, a relic discovered in frozen ice, caves or places whose age remains unknown made it hard to date it in an accurate manner.
So when the process of carbon dating was proposed, the nuclear physicists could determine the approximate age of ages old objects, fossils and extinct materials. One of the mindblowing uses of radioactivity, carbon dating is based on decay rate of carbon’s radioactive isotope C-14 that is absorbed by all the living organisms while alive. Once they die, no additional C-14 gets accumulated and all the C-14 amount already present decays to N-14 making radioactive emissions.
Now let’s know some facts about carbon dating here.
The American chemist Bertram Boltwood was the radiochemistry pioneer who proposed that rocks containing radioactive uranium could be dated by measuring lead amount in it. That’s because uranium converted into lead during radioactive decay took a long period of time. Hence, the amount of lead was directly proportional to its age, meaning, the older the rock the more lead it had.
So Boltwood used the method of radioactive dating for accurate estimation of Earth’s age. Even though this uranium-lead dating method could only be used for samples containing uranium, it did help pave the way for carrying out further research on this dating.
The first ever method for dating organic material (remains of plants and animals) was developed using by American scientist Willard Libby in the late 1940s. Intrigued by the properties of radiocarbon C-14 (the radioactive isotope of carbon), Libby pioneered the method of radiocarbon dating. In 1960, Libby even went on to win Nobel Prize in Chemistry for this pathbreaking scientific method.
The samples of Egyptian artefacts, whose age was already known, were tested by carbon dating method in the early years. Libby got quite reliable (if not much accurate) results from this dating test.
Eventually, Libby was able to determine the age of an object upto 50,000 years with a precision of ± 10%. And this revolutionary method of radiocarbon dating or C-14 dating was used by several scientists for estimation of age of ancient artifacts. They found that it was accurate for samples older only upto 70,000 years as the objects older than this contained way too little C-14 for detection.
The scientists improved their equipments for detection of these elements. In 1939, the cyclotron particle accelerator was used as a mass spectrometer which helped in dating samples as old as 100,000 years.
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