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­ ­As soon as a living organism dies, it stops taking in new carbon.

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.

As the isotopes decay, they give off particles from their nucleus and become a different isotope.

The parent isotope is the original unstable isotope, and daughter isotopes are the stable product of the decay. In the first 5,730 years, the organism will lose half of its C-14 isotopes.

The use of various radioisotopes allows the dating of biological and geological samples with a high degree of accuracy.

There are several different methods for estimating the ages of fossils, including: Paleontologists rely on stratigraphy to date fossils.

Stratigraphy is the science of understanding the strata, or layers, that form the sedimentary record.

On the cover of your ESRT in the top left box you will find the Radioactive Decay Data for four isotopes which we will focus on.

Carbon 14 occurs naturally, and is absorbed by all living things when we eat and drink.




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