As geologists determine the relative age of the geologic time period it to radiometric dating is used to know the ratio of rock. Image showing the 17th century, plants, uranium-235 and early.
scientists use carbon dating when determining the age of fossils that are less than 60,000 years old, and that are composed of organic materials such as wood or leather. Key terms half-life the time required for half of the nuclei in a sample of a specific isotope to undergo radioactive decay.
The half-life for 14 c is approximately 5700 years, therefore the 14 c isotope is only useful for dating fossils up to about 50,000 years old. Fossils older than 50,000 years may have an undetectable amount of 14 c. For older fossils, an isotope with a longer half-life should be used.
scientist examine the rate of decay of carbon isotopes within fossils. Carbon dating, however, is much shorter than newer methods, such as radioactive dating.