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The steeper the slope of the line, the more decay has occurred in a sample and the older the sample is (Dalrymple 20).
The features of the isochron method provide a way do reduce doubt and speculation about an age that is computed using these methods.
This amount is often unknown and is one of the downfalls of conventional radiometric dating.
The old age provided by isochron dating methods obviously conflicts with the young age of only 6,000 years held by these creationists.Radioactive decay has become one of the most useful methods for determining the age of formation of rocks.However, in the very principal of radiometric dating there are several vital assumptions that have to be made in order for the age to be considered valid.Isochron dating bypasses the necessity of knowing the quantity of initial daughter product in the rock by not using that value in the computation.Instead of using the initial quantity of daughter isotope, the ratio of daughter isotope compared to another isotope of the same element (which is not the product of any decay process) is used as the comparison for isochron dating.
As time progresses and decay occurs, the number of atoms of the parent isotope decreases, and the number of atoms of the daughter isotope increases accordingly.