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"It is due to this rapid change that works from those years can be dated extremely accurately," Mandò added.A form of radiometric dating used to determine the age of organic remains in ancient objects, such as archaeological specimens, on the basis of the half-life of carbon-14 and a comparison between the ratio of carbon-12 to carbon-14 in a sample of the remains to the known ratio in living organisms. A technique for measuring the age of organic remains based on the rate of decay of carbon 14.The carbon 14 present in an organism at the time of its death decays at a steady rate, and so the age of the remains can be calculated from the amount of carbon 14 that is left. The cells of all living things contain carbon atoms that they take in from their environment.Back in the 1940s, the American chemist Willard Libby used this fact to determine the ages of organisms long dead.

Carbon 14 is continually being created in the Earth's atmosphere by the interaction of nitrogen and gamma rays from outer space.The team used a particle accelerator to measure the concentration of carbon 14 (an isotope of carbon that has more neutrons than normal carbon 12) in the fabric, which would in turn allow them to determine when the canvas was produced, or more specifically, when the cotton was cut to make the canvas.Carbon 14 is a radioactive variation of carbon, and because plants pick up both types through photosynthesis, all living organisms — cotton plants included — have the same ratio of carbon 14 to stable carbon as the atmosphere.Art forgery is extremely lucrative, but modern dating and analysis techniques have made the identification of forged artwork much simpler.History Art forgery dates back more than two-thousand years.