Of all the isotopic dating methods in use today the uraniumlead method is the oldest and when done carefully the most reliable unlike any other method uraniumlead has a natural crosscheck built into it that shows when nature has tampered with the evidence.
uranium234uranium238 dating method of age determination that makes use of the radioactive decay of uranium238 to uranium234 the method can be used for dating of sediments from either a marine or a playa lake environment.
Radiometric dating or radioactive dating as it is sometimes called is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes.
Some of the isotopes used for this purpose are uranium238 uranium235 and potassium40 each of which has a halflife of more than a million years unfortunately these elements dont exist in dinosaur fossils themselves.
For example the decay of potassium40 to argon40 is used to date rocks older than 20000 years and the decay of uranium238 to lead206 is used for rocks older than 1 million years radiocarbon dating measures radioactive isotopes in onceliving organic material instead of rock using the decay of carbon14 to nitrogen14.
A byproduct of this atomic research has been the development and continuing refinement of the various methods and techniques used to measure the age of earth materials precise dating has been accomplished since 1950.
Absolute dating any method of measuring the age of an event or object in years radiometric dating which uses the concept of radioactive decay is the most common method of absolute dating used to determine the age of rocks and fossils.
Together with stratigraphic principles radiometric dating methods are used in geochronology to establish the geologic time scale among the bestknown techniques are radiocarbon dating potassiumargon dating and uraniumlead dating.
Radiometric dating is often used to prove rocks are millions of years old once you understand the basic science however you can see how wrong assumptions lead to incorrect dates.