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Radioactive decay[ edit ] Example of a radioactive decay chain from lead Pb to lead Pb. The final decay product, lead Pb , is stable and can no longer undergo spontaneous radioactive decay. All ordinary matter is made up of combinations of chemical elements , each with its own atomic number , indicating the number of protons in the atomic nucleus. Additionally, elements may exist in different isotopes , with each isotope of an element differing in the number of neutrons in the nucleus. A particular isotope of a particular element is called a nuclide.

## Radiometric Dating and the Geological Time Scale

## Geology | science | rocketshottarget.com

Key implausible assumptions There are a number of implausible assumptions involved in radiometric dating with respect to long time periods. Initial quantities One key assumption is that the initial quantity of the parent element can be determined. With uranium-lead dating, for example, the process assumes the original proportion of uranium in the sample. 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.

### The London Artifact (Texas)

A major assumption underlying all radioactive dating techniques is that decay rates, which have been essentially constant over the past years, have also been constant over the past 4,,, years. This is a huge and critical assumption that few have questioned. There are a number of evidences which show that radioactive decay rates were once much faster than they are today. For example, scientists have observed dormant or viable bacteria in fossils which are presumably dated to tens or hundreds of millions of years old yet there is no known metabolic process which could account for this.

Gillaspy has taught health science at University of Phoenix and Ashford University and has a degree from Palmer College of Chiropractic. Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes. Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson. Radiometric Dating The aging process in human beings is easy to see.

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