Glauconite radiometric dating municipalities enabling and validating act
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In this processes scientist compare the ratio of Carbon 12, a stable isotope of carbon, to that of Carbon 14, the radioactive isotope.
Both Carbon 12 and Carbon 14 occur naturally within our environment at a constant ratio (although carbon 14 is constantly decaying new carbon 14 is produced in the upper atmosphere as Nitrogen 14 is bombarded by cosmic radiation).
Each radioactive decay series takes a characteristic length of time known as the radioactive half-life, which is the time taken for half of the original (parent) isotope to decay to the new (daughter) isotope.
The decay series of most interest to geologists are those with half-lives of tens, hundreds or thousands of millions of years.
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Because they are the right size some radioactive parent isotopes are capable of being incorporated into some mineral crystals.
If the proportions of parent and daughter isotopes of these decay series can be measured, periods of geological time in millions to thousands of millions of years can be calculated.
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