Radiometric dating example

(Creationists claim that argon escape renders age determinations invalid.

Because argon is an inert gas, it is not possible that it might have been in the mineral when it was first formed from molten magma.(Note that this does not mean that the ratios are the same everywhere on earth.It merely means that the ratios are the same in the particular magma from which the test sample was later taken.) As strontium-87 forms, its ratio to strontium-86 will increase.Rubidium-Strontium dating: The nuclide rubidium-87 decays, with a half life of 48.8 billion years, to strontium-87.Strontium-87 is a stable element; it does not undergo further radioactive decay.

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