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This is well-established for most isotopic systems.
However, construction of an isochron does not require information on the original compositions, using merely the present ratios of the parent and daughter isotopes to a standard isotope.
These radioactive elements constitute independent clocks that allow geologists to determine the age of the rocks in which they occur.But uniformitarianism opposes the biblical account and uses different methods to try to cut God out of the picture altogether.Carbon-14 is by far the most familiar radioisotope dating method used by evolutionists to prove the earth is billions of years old.This is because processes such as the release old carbon into the atmosphere through the burning of fossil fuels and atmospheric nuclear weapons testing have led to dramatic peaks and dips in the amount of carbon 14 in the atmosphere. For example, water can disolve and deposit organic material changing the isotope levels.However, in most cases this can be dealt with in the lab during the sample preperation process.