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Radiocarbon dating can be used on sediments or sedimentary rocks that contain carbon, but it cannot be used on materials older than about 60 ka.K proportion of 0.95, which is equivalent to an age of approximately 96 Ma.In most cases, we cannot use isotopic techniques to directly date fossils or the sedimentary rocks they are found in, but we can constrain their ages by dating igneous rocks that cut across sedimentary rocks, or volcanic ash layers that lie within sedimentary layers.Isotopic dating of rocks, or the minerals in them, is based on the fact that we know the decay rates of certain unstable isotopes of elements and that these rates have been constant over geological time.It has a half-life of 1.3 billion years, meaning that over a period of 1.3 Ga one-half of the Figure 8.14 The decay of 40K over time.Each half-life is 1.3 billion years, so after 3.9 billion years (three half-lives) 12.5% of the original 40K will remain.C) can be applied to many geological materials, including sediments and sedimentary rocks, but the materials in question must be younger than 60 ka.Fragments of wood incorporated into young sediments are good candidates for carbon dating, and this technique has been used widely in studies involving late Pleistocene glaciers and glacial sediments.

It was only in the early part of the 20th century, when isotopic dating methods were first applied, that it became possible to discover the absolute ages of the rocks containing fossils.Radioactive isotopes are used to identify abnormal bodily processes.The isotopes can also be used in plants to measure the amount of radioactivity in the leaves.- Isotopes can be used as tracers - Isotopes can be used as energy source - Isotopes are used for radioactive dating - Isotopes are used…Isotopes are used as tracers in many medical settings.

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