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Radiometric dating (often called radioactive dating) is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they formed.his scheme is used to date old igneous and metamorphic rocks, and has also been used to date lunar samples. Closure temperatures are so high that they are not a concern. Rubidium-strontium dating is not as precise as the uranium-lead method, with errors of 30 to 50 million years for a 3-billion-year-old sample.
Answer by RobertGrebl. Confidence votes 452. To find the absolute age of a given rock, you look at radioactive decay. This involves a radioactive isotope. *Remember that an isotope, essentially, forms of chemical elements that differ in the number of neutrons.If the isotope is radioactive, it will evolve into a decay product.This evolution, or, rather, decay, is predicatable and can be used to determine how old the given rock is.n looking at the decay-product ratio-- that is, the ratio between the mass of a radioactive element and its decay product-- we can calculate the number of half-lives the rock sample has had since it was formed. An example would be if a decay product is 50%, then it has been through exactly 1 half-life.