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It is naturally unstable and so it will spontaneously decay back into N-14 after a period of time.

It takes about 5,730 years for half of a sample of radiocarbon to decay back into nitrogen.

Accelerator Mass Spectrometry (AMS) is a technique for measuring the concentrations of rare isotopes that cannot be detected with conventional mass spectrometers.

The new isotope is called "radiocarbon" because it is radioactive, though it is not dangerous.These two pieces of information are sufficient to completely identify the ion as C atoms at the rate at which they decay.This requires sufficient atoms to be present to provide a large enough decay rate, as described above.Some of the carbon is a radioactive isotope called carbon-14 (C gradually undergoes radioactive decay, transforming it into nitrogen, and therefore gradually "disappears".Scientists can study samples from the once-live creatures' remains to see how much radioactive Autotrophs are organisms that can "make their own food" from an inorganic source of carbon (carbon dioxide) given a source of energy.A molecule of nitrogen gas is made up of two nitrogen atoms.