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Uranium-lead dating uses four different isotopes to find the age of the rock.The four isotopes are uranium-235, uranium-238, lead-207, and lead-206.In a paper published this week in Science, geochemist Roland Mundil of the Berkeley Geochronology Center (BGC) and his colleagues at BGC and UC Berkeley report that uranium/lead (U/Pb) dating can be extremely accurate - to within 250,000 years - but only if the zircons from volcanic ash used in the analysis are specially treated.To date, zircons - known to many as a semiprecious stone and December's birthstone - have often produced confusing and inaccurate results.Definition Uranium–Lead dating is the geological age-determination method that uses the radioactive decay of uranium (U) isotopes (238U, 235U, and also in this entry 232Th) into stable isotopes of lead (Pb) (206Pb, 207Pb, and 208Pb, respectively).

The three main parameters that have to be set are the original amount of uranium and lead in the sample, the rate at which uranium and lead enter and leave the sample, and how much the rate of decay changes.As uranium decays radioactively, it becomes different chemical elements until it stops at lead.The reason for stopping at lead is because lead is not radioactive and will not change into a different element.A secondary electron microscopy image of a zircon from volcanic ash, about four thousandths of an inch (100 microns) across.The zircon has been cut and polished, then treated with high-temperature annealing and chemical abrasion with hydrofluoric acid.

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