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But a very very small proportion of c14(isotope of c12) is present in the elemental state of carbon… When they die, they stop absorbing carbon 14 and the isotope then decays.

Form the time of death of the organism, the quantity of C14, as a proportion of the total carbon in the organism declines and, measuring that decrease allows the age (or time of death) of the organism to be determined. Carbon 14 dating is based on the absorption of atmospheric carbon by living things.

Tin for example has ten stable isotopes, and up towards 20 radioactive ones. There are three naturally occurring isotopes for carbon.

Many other isotopes are used for dating different items, and…

Yes, measurements of the ratio of carbon-14 (radioactive) to carbon-12 (nonradioactive) in a sample is used as a type of clock to determine the age of the sample. Presumably, the organism is eating a constant proportion of C14 while it lives. Carbon for example has two stable isotopes (C12 and C13), and another half-dozen or so of short-lived ones.

The less radioactive decay ammount there is the older it is.

Uranium 238 can only be used to date volcanic rocks of a very old age.

Yes because they look at the ammount of radioactive decay and they can determine the age of the granite.

However, a small percentage of all C exists as the radioactive C14 isotope.

This isotope has a half life of around 500 years if my GCSE Physics memory bank serves me correctly!

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