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To understand how carbon-14 dating works, we need to understand a few things about carbon and its isotopes, how it is formed, and the role it plays in our environment.All living organisms and our environment are made of carbon.Potassium-40 is especially important in potassium–argon (K–Ar) dating.Argon is a gas that does not ordinarily combine with other elements.Rather, it forms compounds from which it is difficult to separate.

As a result under most circumstances we don't expect to find much argon in igneous rocks just after they've formed.Potassium makes up about 2.4 percent of the weight of the Earth's crust and is the seventh most abundant element in it.As it is very electropositive, potassium is never found as the free element in nature.A second problem is that for technical reasons, the measurement of argon and the measurement of potassium have to be made on two different samples, because each measurement requires the destruction of the sample.If the mineral composition of the two sample is different, so that the sample for measuring the potassium is richer or poorer in potassium than the sample used for measuring the argon, then this will be a source of error.It has been proposed that significant core radioactivity (1-2 TW) may be caused by high levels of U, Th, and K.Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials.The most common form of carbon in the atmosphere is carbon-12, which is a stable isotope of carbon.An unstable form of carbon isotope, carbon-14, also known as radiocarbon, is formed when cosmic rays hit atoms in the upper atmosphere of the earth.Ever since its introduction more than 60 years ago by scientist Willard Libby, carbon-14 dating technique has been instrumental in determining the age of organic objects of historical and archeological origin.Carbon-14 dating is a scientific technique to determine the age of archaeological objects of a biological origin.So, when a mineral forms – whether from molten rock, or from substances dissolved in water – it will be initially argon-free, even if there is some argon in the liquid.However, if the mineral contains any potassium, then decay of the K isotope present will create fresh argon-40, that will remain locked up in the mineral.Since the rate at which this conversion occurs is known, it is possible to determine the elapsed time since the mineral formed by measuring the ratio of U, as the source of radiogenic heat.The core also likely contains radiogenic sources, although how much is uncertain.

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