# Carbon 14 dating percentage

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.

This means the above calculations are only evolution speculation and NOT backed up by real science.

So, the fossil is 8,680 years old, meaning the living organism died 8,680 years ago.

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By looking at the ratio of **carbon**-12 to **carbon**-14 in the sample and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing fairly precisely. So, if you had a fossil that had 10 percent **carbon**-14 compared to a living sample, then that fossil would be: t = [ ln (0.10) / (-0.693) ] x 5,700 years t = [ (-2.303) / (-0.693) ] x 5,700 years t = [ 3.323 ] x 5,700 years Because the half-life of **carbon**-14 is 5,700 years, it is only reliable for **dating** objects up to about 60,000 years old.

However, the principle of *carbon*-14 *dating* applies to other isotopes as well.

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.In the case of radiocarbon **dating**, the half-life of **carbon** 14 is 5,730 years.This half life is a relatively small number, which means that **carbon** 14 **dating** is not particularly helpful for very recent deaths and deaths more than 50,000 years ago.The ratio of *carbon*-12 to *carbon*-14 at the moment of death is the same as every other living thing, but the *carbon*-14 decays and is not replaced.The *carbon*-14 decays with its half-life of 5,700 years, while the amount of *carbon*-12 remains constant in the sample.A 10 gram sample of U-238Now that has changed, and some important discoveries are being made.