Radioactive dating of fossils depends on the decay of

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Only one sample is required for this method as both the argon-39 and argon-40 can be extracted from the same sample.

In special cases, bones can be compared by measuring chemicals within them.

Buried bones absorb chemicals, such as uranium and fluorine, from the surrounding ground and absorb more of these chemicals the longer they remain buried.

Another useful chemical analysis technique involves calculating the amount of nitrogen within a bone.The number of tracks increases over time at a rate that depends on the uranium content.It is possible to calculate the age of a sample by measuring the uranium content and the density of the fission tracks.This damage is in the form of tiny marks called fission tracks.When volcanic rocks and minerals are formed, they do not contain fission tracks.

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