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This decay rate, expressed as a statistical constant, is different for each isotope.

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Specific changes in its amino acid structure (racemization or epimerization) which occur at a slow, relatively uniform rate, are measured after the organism's death.The time between the neutron activation of the sample and the measurement of the gamma rays depends on the half-lives of the radioactive isotopes, which may range from seconds to thousands of years: often a few weeks may be necessary before measurement takes place.Neutron spectrometry since it analyzes the whole specimen as opposed to the surface only.The reasons for the fluctuation are not yet fully understood.The calibration of radiocarbon dates is therefore necessary in order to achieve an approximate date in calendar years.Dates quoted in radiocarbon years, before calibration, are written .

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