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Uses of radioactive isotopes - Chemistry
Video about radioisotopes used in radiometric dating:
The temperature at which this happens is known as the closure temperature or blocking temperature and is specific to a particular material and isotopic system. This normally involves isotope-ratio mass spectrometry. Where feasible, two or more methods of analysis are used on the same specimen of rock to confirm the results. The other materials such as rocks that mark the earth was so many millions of fossils. These radioactive isotopes are unstable, decaying over time at a predictable rate. Alternatively, if several different minerals can be dated from the same sample and are assumed to be formed by the same event and were in equilibrium with the reservoir when they formed, they should form an isochron. Exposure to sunlight or heat releases these charges, effectively "bleaching" the sample and resetting the clock to zero. This predictability allows the relative abundances of related nuclides to be used as a clock to measure the time from the incorporation of the original nuclides into a material to the present. Finally, correlation between different isotopic dating methods may be required to confirm the age of a sample. Accuracy levels of within twenty million years in ages of two-and-a-half billion years are achievable. Older materials can be dated using zircon , apatite , titanite , epidote and garnet which have a variable amount of uranium content. However, rocks and other objects in nature do not give off such obvious clues about how long they have been around. This page is URL: Half-life is the amount of time it takes for half of the parent isotopes to decay. Carbon is a radioactive isotope of carbon, with a half-life of 5, years,   which is very short compared with the above isotopes and decays into nitrogen. Radioactive decay[ edit ] Example of a radioactive decay chain from lead Pb to lead Pb.
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