# Radioactive isotope used for age dating

By far the most common is radioactive dating which involves checking the amount of a given radioactive isotope in a given sample is left over (and calculating from the half-life [the time it takes for a radioactive element/isotope to decay to half the original amount]). The percent of the radioactive isotope in the specimen is accumulated to normal levels as the thing was alive, after it is dead it… They use an isotope (Technetium-99) which decays into the slowly-decaying radioisotope Technetium-98..they use this because, with a medically-useful half-life of a little over six hours, the patient is exposed to radiation for only as long as he or she needs to be. The half lives of carbon isotopes are derived by studying their radioactive decay.

Another one would likely be tree-ring dating which only determines the age of trees by how many rings it has. Carbon dating is a process that scientists use to try to ascertain the age of an item by analyzing the amount of a radioactive carbon isotope that is present in the item. For carbon dating, the isotope used is Carbon-14, which has a half life of 5,700 years.

So, if you know how much of the radioactive isotope is still left in the sample, then you can work out how long it would have taken for the rest to have decayed into other…

Carbon dating is one type of radiometric dating, there are others.

Radioactive isotopes are used for radioactive dating.For example, you would use radioactive isotope Carbon-14 to date anything under 70,000 years that was once living.Radioactive isotopes decay from their parent isotope to daughter isotope at a constant rate (under any circumstances).The rate at which a parent isotope decays to its daughter isotope is considered one half life.Carbon-14 has a half life of 5730 years and its daughter isotope is Nitrogen-14. In radiometric dating, the amount of a certain radioactive isotope in an object is compared with a reference amount.