Since it is radioactive, it gradually fades away by radioactive decay until it is all gone.
Radiocarbon dating uses carbon-14 to determine the last time something (or someone) was alive.
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This discussion is a simplified introduction to radiocarbon dating.
If you have a fossil, you can tell how old it is by the carbon 14 dating method.
This is a formula which helps you to date a fossil by its carbon.
When they stop living, they stop taking in carbon-14 from the air around them, and the amount of carbon-14 in the remains gradually disappears.
A radiocarbon dating laboratory is able to measure the amount of carbon-14 remaining in a fossil.
Their bodies are said to be in “equilibrium” with carbon-14 in the air.
Although carbon-14 is radioactively decaying away in the body, it is constantly being replaced by new photosynthesis or the ingestion of food, leaving the amount relatively constant.
It is incorporated into plants through photosynthesis, and then into animals when they consume plants.
The carbon-14 undergoes radioactive decay once the plant or animal dies, and measuring the amount of carbon-14 in a sample conveys information about when the plant or animal died.
This carbon-14 immediately starts to radioactively decay but is constantly being recreated.