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But it is obvious they are still a way short of 70,000 years.
They also point out one more problem associated with the need for wanting a longer time record to calibrate the carbon clock: the C14 method depends on the assumption that the amount of C14 forming in the atmosphere has been constant.
When animals and plants are alive they take both ordinary carbon (C12) and radioactive carbon ( C14) into their body through their food and through the air they breathe, so the amount of C14 in their body is similar to what is in the environment.
When they die they cease taking in carbon of any kind.
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As a result scientists can measure the ratio of normal carbon (C12) to radioactive C14 and use the ratio to estimate how long a plant animal or any products from them such as timber or cloth, has been dead.