Radiometric dating uranium 235

Fortunately, we are able to date older fossils using the radiometric breakdown of other elements (Potassium-Argon dating, Argon-Argon dating, and Rubidium dating [I'm writing this without any refs - so this last one might be wrong]).Usually the radioactive 'clocks' for these elements are started when the elements are deposited by a volcanic eruption (usually in the form of ash).

By matching the proportion of original unstable isotope to stable decay product, and knowing the half-life of that element, one can thus deduce the age of the rock, as shown in the following diagram.However, the error range increases drastically once you pass 50,000 years.Also, it is of little use in anything more recent than 5,000 years ago.With the discovery of radiometric dating, it became possible for the first time to attempt precise figures.Radiometric dating works on the principle that certain atoms and isotopes are unstable.

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