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Parent Decay and Daughter Growth Curves Radiocarbon Dating Dating Rocks with the Rb-Sr "Isochron" Method Getting a Rock Sample Ready for the Mass Spectrometer A Mass Spectrometer is used to Measure Isotopic Ratios A numerical (or "absolute") age is a specific number of years, like 150 million years ago.

Therefore, a highly weathered rock may yield unreliable age information. Crush the rock and separate the Rb-bearing minerals.

Getting a Rock Sample Ready for the Mass Spectrometer For reliable age determination, careful sample preparation is an important and often tedious process.

Each mineral separate will yield the composition of that particular mineral.

Other Steps There are other steps that must be carried out to prepare a sample for analysis by a mass spectrometer, such as converting the sample to a solution by dissolving the mineral separates in selected acids, using techniques of column chemistry to increase the concentration of the small amounts of Rb and Sr in the solution and then precipitating the concentrated solution as a "salt" compound.

Understanding the isochron diagram is the key to determining the age of a rock using the Rb-Sr method.

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