# Radioactive decay age dating

A young-Earther would object to all of the "assumptions" listed above.

When an organism dies it ceases to replenish carbon in its tissues and the decay of carbon 14 to nitrogen 14 changes the ratio of carbon 12 to carbon 14.

Experts can compare the ratio of carbon 12 to carbon 14 in dead material to the ratio when the organism was alive to estimate the date of its death.

Carbon is naturally in all living organisms and is replenished in the tissues by eating other organisms or by breathing air that contains carbon.

At any particular time all living organisms have approximately the same ratio of carbon 12 to carbon 14 in their tissues.

This causes the data points to separate from each other.

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.

If the fossil has 35% of its carbon 14 still, then we can substitute values into our equation.So, the fossil is 8,680 years old, meaning the living organism died 8,680 years ago.he generally accepted age for the Earth and the rest of the solar system is about 4.55 billion years (plus or minus about 1%).After 5,730 years, the amount of carbon 14 left in the body is half of the original amount.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.See the Isochron Dating FAQ or Faure (1986, chapter 18) for technical detail.