Luckily, we are in a position to measure these fluctuations in samples which are dated by other strategies. Tree rings could be counted and their radiocarbon content measured. From these information a “calibration curve” may be built (see figure 2, below). Since carbon-12 doesn’t decay, it’s a good benchmark towards which to measure carbon-14’s inevitable demise. The less radioactivity a carbon-14 isotope emits, the older it is. And since animals and vegetation stop absorbing carbon-14 after they start to decay, the radioactivity of the carbon-14 that’s left behind reveals their age.
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