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    Rubidium strontium dating calculator

    Some of the most commonly used radiometric schemes are [Dalrymple1991, pg. 55]: Each method has its own particular range of applicability, which derives from the half-life of the particular radioactive decay involved.

    This means that as the rubidium-87 decays and more strontium-87 is formed, the ratio will change.However, if one knows the scientific formula for interpreting these transitions, the results can be "highly precise" according to paleontologist Guy Narbonne (Kerr, 789).The half-life of uranium-235 is 704 million years, while the half-life of uranium-238 is 4.5 billion years.This is in part because uranium and lead are not retained in rocks as easily as some others, and in part because the parent isotopes and daughter products are not even directly related.For the isotopes uranium-235 and uranium-238 to respectively become lead-207 and lead-206, they must first undergo a serious of highly unstable transformations into isotopes with very short half-lives.

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