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Since C-14 is formed in the atmosphere, it is most abundant in CO2 in the atmosphere.
This is how it is incorporated into life forms, both plants and animals readily incorporate atmospheric gases into their systems. Carbon-14 is a radioactive element, it spontaneously undergoes beta decay and forms Nitrogen-14, a stable isotope of a different element (one less proton).
Carbon-14 has two more neutrons than stable carbon, and thus has a mass that is greater by two.
While this is an extremely trace amount, over time it is incorporated into the systems of most life forms.
Therefore, the amount of radioactive carbon in the system will only decrease and form Nitrogen.
Through experimentation it has been determined that Carbon-14 has a half-life of about 5,370 years.
It is especially useful in determining the age of volcanic rocks which often contain potassium.
Like carbon, potassium has three natural isotopes, one of which is radioactive.
One of the primary decay products of K-40 is Ar-40--a stable and unreactive gas.