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Some background on Rubidium and Strontium: Rb is a highly incompatible element.

Sr is fairly incompatible in mafic systems and relatively incompatible in silica-rich systems.

Large amounts of energy and smaller atoms are produced during fission.

The first application of this discovery was in the making of nuclear weapons, such as the atomic bomb.

Uranium occurs near the beginning of the actinide family.

The actinide family consists of elements with atomic numbers 90 through 103.

The above equation tells us the absolute amount of Strontium-87 in the rock sample.

By "age" we mean the elapsed time from when the mineral specimen was formed.Concurrently, the crust will become enriched in Rb relative to Sr.A brief introduction to the radiogenic relationship between Rb and Sr: Rubidium-87 decays to Strontium-87 by beta decay according to the following equation: The amount of 87Sr found in a sample at any time is determined by the decay constant of 87Rb, the initial amount of 87Sr in the sample, the time since the initial time and the ratio of Rb to Sr in the system. Where lambda is the decay constant and t is the age of the system.Radioactive elements "decay" (that is, change into other elements) by "half lives." If a half life is equal to one year, then one half of the radioactive element will have decayed in the first year after the mineral was formed; one half of the remainder will decay in the next year (leaving one-fourth remaining), and so forth.The formula for the fraction remaining is one-half raised to the power given by the number of years divided by the half-life (in other words raised to a power equal to the number of half-lives).




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