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Strontium 90 dating

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Rubidium–strontium dating

Example[ edit ] For example, consider the case of an igneous rock such as a granite that contains several major Sr-bearing minerals including plagioclase feldspar , K-feldspar , hornblende , biotite , and muscovite. Rubidium substitutes for potassium within the lattice of minerals at a rate proportional to its concentration within the melt. The ideal scenario according to Bowen's reaction series would see a granite melt begin crystallizing a cumulate assemblage of plagioclase and hornblende i. This then causes orthoclase and biotite, both K rich minerals into which Rb can substitute, to precipitate. The resulting Rb-Sr ratios and Rb and Sr abundances of both the whole rocks and their component minerals will be markedly different. This, thus, allows a different rate of radiogenic Sr to evolve in the separate rocks and their component minerals as time progresses. Calculating the age[ edit ] The age of a sample is determined by analysing several minerals within multiple subsamples from different parts of the original sample.

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Epub Apr Dating human skeletal remains using a radiometric method: Currently, there are no reliable methods to resolve PMI, the determination of which relies almost exclusively on the experience of the investigating expert. Here we measured 90 Sr and Pb Po incorporated into bones through a biogenic process as indicators of the time elapsed since death.

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May 20, Strontium also plays an important role in figuring out the origins of species: Anthropologists measure the levels of strontium ions in bones and teeth to help determine the geographic origins of ancient humans and animals.

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Biological activity[ edit ] Strontium is a " bone seeker " that exhibits biochemical behavior similar to calcium , the next lighter group 2 element. Exposure to 90Sr can be tested by a bioassay , most commonly by urinalysis. However, by averaging all excretion paths, the overall biological half life is estimated to be about 18 years. As strontium has an affinity to the calcium-sensing receptor of parathyroid cells that is similar to that of calcium, the increased risk of liquidators of the Chernobyl power plant to suffer from primary hyperparathyroidism could be explained by binding of strontium Controlled amounts of 90Sr and 89Sr can be used in treatment of bone cancer , and to treat coronary restenosis via vasuclar brachytherapy.

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