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Because the cosmic ray bombardment is fairly constant, there’s a near-constant level of carbon-14 to carbon-12 ratio in Earth’s atmosphere.Organisms at the base of the food chain that photosynthesize – for example, plants and algae – use the carbon in Earth’s atmosphere.Here’s an example using the simplest atom, hydrogen. Carbon-14 is an unstable isotope of carbon that will eventually decay at a known rate to become carbon-12.

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In dead material, the decayed 14C is not replaced and its concentration in the object decreases slowly.Therefore, the half-life of a radioactive element is independent of the amount of sample.With the help of half-life values of a suitable radioisotope of an element, which is present in a rock, or in an artifact, the age of the rock and the artifact can be determined.It is assumed that level of carbon-14 in the atmosphere is constant.Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks.

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