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I want to emphasize that I have only dealt with two of the commonly used radiometric methods, and I have only outlined the most elementary of the checks that geologists use in applying them.(More details can be found in Eicher 1968, chapter 6; and Faul 1966.) From what I have said it might seem that the assignment of ages to rocks is still a bit uncertain.Here it is possible to use two decay processes, the decay of uranium-238 into lead-206 and the decay of uranium-235 into lead-207.Furthermore, the amount of lead originally present can be computed by considering another isotope of lead.

The result of this enormous array of tests is a consensus. The process rate must always have been the same" (Morris 1974a, 138).The chief defect of the potassiumargon method is that, under the action of heat or compression, argon can escape from rocks, so that the estimated age is less than the true value.A second common method of radiometric dating involves the decay of uranium into lead.Minerals can be tested for their capacity to absorb extra argon under experimental conditions designed to resemble their natural environment, and geologists can screen out, in this way, minerals that are liable to give erroneous results.In the second case, the existence of two separate decay processes provides a check on the assumption that the system has not been contaminated.




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