Definition of radioactive dating

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What is Radioactive Dating? - Definition & Facts

Discover how scientists determine the age of fossils, rocks, and other geologic phenomena by using the known half-lives of isotopes within each specimen, a technique known as radioactive dating. Radioactive Dating Ever wonder how scientists concluded the age of the earth to be about 4. Well, scientists are able to answer all of these wondrous questions and more by use of a process called radiometric, or radioactive, dating. Radioactive dating enables geologists to record the history of the earth and its events, such as the dinosaur era, within what they call the geologic time scale. Radioactive dating uses the ratios of isotopes and their specific decay products to determine the ages of rocks, fossils, and other substances. Radioactivity Defined Elements occur naturally in the earth, and they can tell us a lot about its past. Carbon, uranium, and potassium are just a few examples of elements used in radioactive dating. Each element is made up of atoms, and within each atom is a central particle called a nucleus. Within the nucleus, we find neutrons and protons; but for now, let's just focus on the neutrons.

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. Some nuclides are inherently unstable.

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Radiometric dating is a means of determining the "age" of a mineral specimen by determining the relative amounts present of certain radioactive elements. By "age" we mean the elapsed time from when the mineral specimen was formed. Radioactive elements "decay" that is, change into other elements by "half lives. The formula for the fraction remaining is one-half raised to the power given by the number of years divided by the half-life in other words raised to a power equal to the number of half-lives.

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Radioactive Dating

Radioactive Dating Because the radioactive half-life of a given radioisotope is not affected by temperature, physical or chemical state, or any other influence of the environment outside the nucleus save direct particle interactions with the nucleus, then radioactive samples continue to decay at a predictable rate and can be used as a clock. This makes several types of radioactive dating feasible. For geologic dating, where the time span is on the order of the age of the earth and the methods use the clocks in the rocks , there are two main uncertainties in the dating process: What was the amount of the daughter element when the rocks were formed? Have any of the parent or daughter atoms been added or removed during the process?

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