Isotopes frequently used in radiometric dating worksheet

Some measure the decay of isotopes more indirectly.For example, fission track dating measures the microscopic marks left in crystals by subatomic particles from decaying isotopes.

After 5,730 years, the amount of carbon 14 left in the body is half of the original amount.They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.This is different to relative dating, which only puts geological events in time Most absolute dates for rocks are obtained with radiometric methods.Because of their unique decay rates, different elements are used for dating different age ranges.For example, the decay of potassium-40 to argon-40 is used to date rocks older than 20,000 years, and the decay of uranium-238 to lead-206 is used for rocks older than 1 million years.