Has radiometric dating ever been wrong
An expert scientist summarizes: "The first radiometric dates, generated about 1920, showed that the Earth was hundreds of millions, or billions, of years old.Anyone questioning the accuracy of radiometric methods is obliged to explain why the cross-checks to sediments, coral growth, tree rings, and other isotope pairs all have the same errors.Why would an error in radiometric dating correspond to errors in the other methods so that they all track?The coral record verifies that radiometric methods are accurate. For the purposes of assessing accuracy, each of the methods is assumed to be applied in accordance with the established methods and technology.
By analogy, a stop watch will not keep accurate time if it is not wound, if it is not in good repair, or if the operator forgets to press the button.
Thus the physical principle of the method is well established. The dates obtained by radiometric dating are verified by independent methods, including dendrochronology (tree rings), varve chronology (sediment layers), ice cores, coral banding, speleotherms (cave formations), fission track dating, and electron spin resonance dating.