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this scheme has been refined to the point that the error margin in dates of rocks can be as low as less than two million years in two-and-a-half billion years. all the samples show loss of lead isotopes, but the intercept of the errorchron (straight line through the sample points) and the concordia (curve) shows the correct age of the rock.
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the procedures used to isolate and analyze the parent and daughter nuclides must be precise and accurate.
dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.-lead dating is often performed on the mineral zircon (zrsio4), though it can be used on other materials, such as baddeleyite, as well as monazite (see: monazite geochronology).