Radiometric dating methods flaws dating guidance
There are about two dozen decay pairs used for dating.Uranium 235 decay to lead has a half-life of 713 million years, so it is well suited to dating the universe.There are three reasons why radiometric data is known to be accurate: 1.It depends upon radioactive decay, which is known to be extremely stable, not influenced my chemical processes, and which can be measured quite accurately.Measuring the ratio of C14 to C12 and C13 therefore dates the organic matter for periods back to about eight half-lives of the isotope, 45,000 years.After a long enough time the minority isotope is in an amount too small to be measured.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.
An error of 90% would, for example, still disprove Young Earth Creationism.
For example, the C14 concentration in the atmosphere depends upon cosmic ray intensity.
To take this into account, a calibration curve is developed using other dating methods to establish the C14 levels over time.
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.
other isotope pairs cover intermediate time periods between the spans for carbon 14 and uranium.