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Each of these minerals has a different initial rubidium/strontium ratio dependent on their potassium content, the concentration of Rb and K in the melt and the temperature at which the minerals formed.
Rubidium substitutes for potassium within the lattice of minerals at a rate proportional to its concentration within the melt.
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.
For the Rb-Sr system, λ = 1.42 x10 The graph shown below indicates the points plotted, the regression line and its equation.
This isotope system can be used as a natural clock to determine the age of many old rocks.The time interval it takes for the parent atoms to decay by half is always the same, no matter how much of the parent element remains.This constant length of time is called the Some common rocks are weakly radioactive.These radioactive isotopes and their half-lives can be used as our natural clock, i.e., we can find out how old certain rocks are from this information. Using Math to Find the Age of Rock in Southwest Colorado In this section, we will guide you through the process of finding the age of a sample of gabbro found at Electra Lake, just north of Durango in southwest Colorado.Following this, you can repeat these steps to estimate the age of the Earth.
It was discovered that some chemical elements, notably uranium and thorium, are strongly radioactive.