![]() ![]() ![]() You probably have seen or read news stories about fascinating ancient artifacts. While carbon-14 is commonly used for dating, the principle applies to other isotopes as well, such as potassium-40 and uranium-235, but the accuracy of radioisotope dating may be compromised for anything that dies after the 1940s due to changes in carbon ratios from nuclear activities and fossil fuel burning.The half-life of carbon-14 is 5,700 years, making it reliable for dating organic matter up to about 60,000 years old, with a formula provided to calculate the conventional radiocarbon age (CRA) of a given sample.Carbon-14 dating works by comparing the ratio of carbon-12 to carbon-14 in a sample to that in a living organism, allowing for the determination of the age of formerly living things fairly precisely. ![]()
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