Trapped charge dating
Carbon-14 moves up the food chain as animals eat plants and as predators eat other animals. It takes 5,730 years for half the carbon-14 to change to nitrogen; this is the half-life of carbon-14.
After another 5,730 years only one-quarter of the original carbon-14 will remain.
Radiocarbon percentage of the quantity of the radioisotope will decay over a period of time.
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Trapped charge dating methods including luminescence and electron spin resonance (ESR) dating are based on the accumulation of unpaired electrons in minerals due to the natural radioactivity.