Absolute dating geology definition

By matching the tree rings on an archaeological sample to the master sequence of tree ring patterns, the absolute age of a sample is established.The best known dendrochronological sequences are those of the American Southwest, where wood is preserved by aridity, and Central Europe, where wood is often preserved by waterlogging.For inorganic materials, such as rocks containing the radioactive isotope rubidium, the amount of the isotope in the object is compared to the amount of the isotope's decay products (in this case strontium).

Other methods that depend on the effects of radioactive decay include fission track dating and thermoluminescence.When light is used rather than heat to free the accumulated electrons, the technique is known as optically stimulated resonance.Yet another technique measures the quantity of trapped electrons by detecting the amount of microwave radiation they absorb (electron-spin resonance); it has the advantage that it can be utilized several times on a given sample.any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.A method for determining the age of an object based on the concentration of a particular radioactive isotope contained within it.

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