Is radiometric age dating accurate michael cassidy dating
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.The multiple checks verify that the rate of isotope decay does not change over time, and it verifies the accuracies of the methods.In fact, they track because radiometric data is accurate.An expert scientist summarizes: "The first radiometric dates, generated about 1920, showed that the Earth was hundreds of millions, or billions, of years old.Every few years, new geologic time scales are published, providing the latest dates for major time lines.Older dates may change by a few million years up and down, but younger dates are stable.
Carbon 14 is created by cosmic rays in the upper atmosphere.
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.
Other methods do not require knowing the initial quantities.
For example, potassium decays into two different isotopes of argon having different half-lives.