Example of radioisotope dating
It is more accurate for shorter time periods (e.g., hundreds of years) during which control variables are less likely to change.There are a number of implausible assumptions involved in radiometric dating with respect to long time periods.For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.
With uranium-lead dating, for example, the process assumes the original proportion of uranium in the sample.There's a small amount of radioactive carbon-14 in all living organisms.When they die no new carbon-14 is taken in by the dead organism.One assumption that can be made is that all the lead in the sample was once uranium, but if there was lead there to start with, this assumption is not valid, and any date based on that assumption will be incorrect (too old).
Radiometric dating is mostly used to determine the age of rocks, though a particular form of radiometric dating—called Radiocarbon dating—can date wood, cloth, skeletons, and other organic material.
Because radiometric dating fails to satisfy standards of testability and falsifiability, claims based on radiometric dating may fail to qualify under the Daubert standard for court-admissible scientific evidence.