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Also the argon-argon dating technique can be used for the potassium-argon sequence to ensure that no initial and half-life of the parent isotope, which can be obtained from tables such as the one given in [1]: Although radiometric dating is accurate in principle, the precision is very dependent on the care with which the procedure is performed.The possible confounding effects of initial contamination of parent and daughter isotopes have to be considered, as do the effects of any loss or gain of such isotopes since the sample was created.Additionally, elements may exist in different isotopes, with each isotope of an element differing only in the number of neutrons in the nucleus.A particular isotope of a particular element is called a nuclide. That is, at some random point in time, an atom of such a nuclide will be transformed into a different nuclide by the process known as radioactive decay.In addition, the initial element and the decay product should not be produced or depleted in significant amounts by other reactions.The procedures used to isolate and analyze the reaction products must be straightforward and reliable.In most cases, the half-life of a nuclide depends solely on its nuclear properties; it is not affected by temperature, chemical environment, magnetic and electric fields, or any other external factors.

Nuclides useful for radiometric dating have half-lives ranging from a few thousand to a few billion years.Finally, correlation between different isotopic dating methods may be required to confirm the age of a sample.The precision of a method of dating depends in part on the half-life of the radioactive isotope involved.After one half-life has elapsed, one half of the atoms of the substance in question will have decayed.Many radioactive substances decay from one nuclide into a final, stable decay product (or "daughter") through a series of steps known as a decay chain.

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All these results have been reported in the conventional scientific literature. Pieces of fossilized wood in Oligocene, Eocene, Creta- ceous, Jurassic, Triassic, and Permian rock layers supposedly 32–250 million years old all contain meas- urable radiocarbon, equivalent to “ages” of 20,700 to 44,700 years. Similarly, carefully sampled pieces of coal from ten U. coal beds, ranging from Eocene to Pennsylvanian and supposedly 40–320 million years old, all contained similar radiocarbon levels equivalent to “ages” of 48,000 to 50,000 years.

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