Archaeological dating isotopes

Plankton absorbs, Carbon-14 from the ocean much like terrestrial plants absorb Carbon-14 from the air.Since plankton is the foundation of the marine food chain, Carbon-14 is spread throughout aquatic life.

One good example would be the elevated levels of Carbon-14 in our atmosphere since WWII as a result of atomic bombs testing.Looking at the graph, 100% of radiocarbon in a sample will be reduced to 50% after 5730 years.In 11,460 years, half of the 50% will remain, or 25%, and so on.In a stratigraphical context objects closer to the surface are more recent in time relative to items deeper in the ground.Although relative dating can work well in certain areas, several problems arise.

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Long tree-ring sequences have been developed throughout the world and can be used to check and calibrate radiocarbon dates.

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