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    Does carbon 13 dating work

    Along with hydrogen, nitrogen, oxygen, phosphorus, and sulfur, carbon is a building block of biochemical molecules ranging from fats, proteins, and carbohydrates to active substances such as hormones.

    All carbon atoms have a nucleus containing six protons.

    However, no more carbon-14 is absorbed after the organism dies.

    So organisms reach a C-14 equilibrium concentration with the atmosphere.

    But once an organism dies, it no longer takes in C-14. Knowing the half-life of C-14 and the approximate concentration in living organisms, one can take a dead organism and measure its concentration of C-14, determining how much has decayed - and by that, how long it took for that much to have decayed.

    Since the 1960s, scientists have started accounting for the variations by calibrating the clock against the known ages of tree rings.

    Radio carbon dating works on the principle of radioactive decay.

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