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Here are the three major assumptions for your consideration: Are these foundational assumptions reasonable?Recent findings seem to indicate that though we ourselves have not been able to vary the decay rates by much in the laboratory, the decay rates may have been accelerated in the unobservable past .This is at first glance surprising, because of the ease with which one would expect helium (with its tiny, light, unreactive atoms) to escape from the spaces within the crystal structure.There should hardly be any left, because with such a slow buildup, it should be seeping out continually and not accumulating.
(This is consistent with the geologic 'age' assigned to the granites in which these zircons are found.) There is a significant amount of helium from that '1.5 billion years of decay' still inside the zircons.
Radiometric Dating - A Brief Explanation Radiometric dating is the primary dating scheme employed by scientists to determine the age of the earth.
Radiometric dating techniques take advantage of the natural decay of radioisotopes.
Radiometric dating is a process of identifying the age of a material based on known half-lives of decaying radioactive materials found in both organic and inorganic objects.
Radiometric dating is often used to determine the age of rocks, bones, and ancient artifacts.
Because this new element (decay product) remains on or within the object, scientists can easily determine how old the object is. A mass spectrometer is a fundamental device in any radiometric dating experiment.