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), the number decreases to half of its original value.Half of what remains decays in the next half-life, and half of that in the next, and so on.The time in which half of the original number of nuclei decay is defined as the .After one half-life passes, half of the remaining nuclei will decay in the next half-life.The relatively short-lived C taken into organic matter is also slightly variable. However, under about 20,000 years the results can be compared with dendrochronology, based on tree rings.For the most accurate work, variations are compensated by means of calibration curves.
In 1960, he was awarded the Nobel Prize in Chemistry for this work.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.