Animals eat the plants, and ultimately the radiocarbon is distributed throughout the biosphere. This involves electron capture or positron decay of potassium to argon Older materials can be dated using zirconapatitetitaniteepidote and garnet which have a variable amount of uranium content. Traditional OSL only goes back aroundyears. The radiation causes charge to remain within the grains in structurally unstable "electron traps".
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Isotopic systems that have been exploited for radiometric dating have half-lives ranging from only about 10 years e. The carbon isotope would vanish from Earth's atmosphere in less than a million years were it not for the constant influx of cosmic rays interacting with atmospheric nitrogen. Carbon is a radioactive isotope of carbon, with a half-life of 5, years,   which is very short compared with the above isotopes and decays into nitrogen. Animals eat the plants, and ultimately the radiocarbon is distributed throughout the biosphere. Related 6.