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Geologists do not use carbon-based radiometric dating to determine the age of rocks.

Carbon dating only works for objects that are younger than about 50,000 years, and most rocks of interest are older than that.

Carbon dating is used by archeologists to date trees, plants, and animal remains; as well as human artifacts made from wood and leather; because these items are generally younger than 50,000 years.

Some of those sugars are made into long chain molecules like cellulose, which makes up most of the woody, pulpy portion of trees and plants.

Carbon dioxide gas also dissolves in water, sometimes forming carbonic acid.

Geologists measure the abundance of these radioisotopes instead to date rocks.

Archaeologists use the exponential, radioactive decay of carbon 14 to estimate the death dates of organic material.

If the amount of carbon 14 is halved every 5,730 years, it will not take very long to reach an amount that is too small to analyze.

When finding the age of an organic organism we need to consider the half-life of carbon 14 as well as the rate of decay, which is –0.693.For example, say a fossil is found that has 35% carbon 14 compared to the living sample. We can use a formula for carbon 14 dating to find the answer.Where t is the age of the fossil (or the date of death) and ln() is the natural logarithm function.When researchers find a bone or artifact, how do they know how old it is?While there are a number of answers to that question, most of which depend largely on the age and surroundings of the item, carbon dating is surely one of the most important.Because of the short length of the carbon-14 half-life, carbon dating is only accurate for items that are thousands to tens of thousands of years old. Geologists must therefore use elements with longer half-lives.

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