Without this calibration, atmospheric fluctuations in C cause some radiocarbon dates to have an error up to 10%.
Carbon isotopes are generally measured through the use of a machine called the accelerated mass spectrometer.
Nuclear decay has a constant rate of decay, but as it turns out, the formation of C has been reliably calibrated to tens of thousands of years.
(This is consistent with the geologic ‘age’ assigned to the granites in which these zircons are found.) There is a significant amount of helium from that ‘1.5 billion years of decay’ still inside the zircons.Is there any evidence for the Bible's view of a young earth?What is Progressive Creationism and is it biblical? Samples significantly older than this have very little or even no measurable C left.In order to function properly, natural clocks need an irreversible process that occurs at a constant and known rate.There still remains a lot of research to do, but, as it currently stands, the accuracy of radiometric dating remains ambiguously suspect at best.Related Topics: Is carbon dating a reliable method for determining the age of things?…Results show that because of all the helium still in the zircons, these crystals (and since this is Precambrian basement granite, by implication the whole earth) could not be older than between 4,000 and 14,000 years.In other words, in only a few thousand years, 1.5 billion years’ worth (at today’s rates) of radioactive decay has taken place” (Through the process of photosynthesis, plants absorb carbon dioxide which contains C left in a sample to accurately measure without contamination.Theoretically, radiocarbon techniques have the ability to date samples to around 75,000 years, but the working threshold of reliable dating is around 50,000 years.