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How does radiometric dating help scientists pinpoint the age of a fossil? Radiometric dating allows scientists to find fossils in only the lowest and oldest layers of sediment. Radiometric dating shows the rate of decay of radioactive material present in any object.By comparing the carbon they can tell the exact age of the fossil. In radiometric dating, scientists place samples of a fossil in certain liquids until the samples dissolve.Examples: Archeologists may employ the well known method of carbon 14 dating.The technique measures the radioactivity of carbon 14 in a biological sample that may have been preserved for hundreds of years or tens of thousands of years.Knowing that the carbon 14 has a half life of 5,730 years allows the estimation of the age of the object based on the fraction of carbon 14 remaining.Uranium-lead dating is an established radiometric dating technique.

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There are many radioactive elements and thus many applications of the basic principle.Once this rate is known, geologists can estimate the length of time over which decay has been occurring by measuring the amount of radioactive parent element and the amount of stable daughter elements.Examples: Radioactive parent isotopes and their stable daughter products Radioactive Parent Stable Daughter Potassium 40 Argon 40 Rubidium 87 Strontium 87 Thorium 232 Lead 208 Uranium 235 Lead 207 Uranium 238 Lead 206 Carbon 14 Nitrogen 14 In the above table, note that the number is the mass number (the total number of protons plus neutrons).Amazingly, this was all done before isotopes were known, and before the decay rates were known accurately.The invention of the MASS SPECTROMETER after World War I (post-1918) led to the discovery of more than 200 isotopes.




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