Following this, you can repeat these steps to estimate the age of the Earth.Sr is not a product of decay but is used as a reference isotope.The decay constant, usually denoted by Greek letter lambda, λ, is specific to an isotope system.It can be determined experimentally or by using the half-life, and is equivalent to the fraction of atoms that decays per some interval of time.The translations of rubidium-strontium dating from English to other languages presented in this section have been obtained through automatic statistical translation; where the essential translation unit is the word «rubidium-strontium dating» in English.
The utility of the rubidium-strontium isotope system results from the fact that 87Rb decays to 87Sr with a half life of 48.8 billion years.
The transformation occurs either by loss of particles from, or addition of particles to, the parent nucleus.
In some parent-daughter pairs, the daughter is still radioactive and subject to further decay to a new daughter.
Different minerals in a given geologic setting can acquire distinctly different ratios of radiogenic strontium-87 to naturally occurring...a technique for determining the age of minerals based on the occurrence in natural rubidium of a fixed amount of the radioisotope 87Rb which decays to the stable strontium isotope 87Sr with a half-life of 4.7 × 1011 years. rubidium–strontium dating A technique for dating rocks. These ratios evolve through time in a predictable manner.
Measurement of the ratio of these isotopes thus gives the age of a mineral, for ages of up to about 4 × 109 years.
In addition, Rb is a highly incompatible element that, during fractional crystallization of the mantle, stays in the magmatic melt rather than becoming part of mantle minerals.