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As a first approximation one can assume this, but more accurate results must take into account fluctuations in the intensity of the cosmic rays entering the Earth's atmosphere.
These deviations were determined from the comparative dating of ancient tree rings (a field called C have been added to the atmosphere, mostly as a result of nuclear weapons testing.
Potassium-argon dating is used to determine the age of igneous rocks based on the ratio of an unstable isotope of potassium to that of argon.
Potassium is a common element found in many minerals.
By 1965, atmospheric C concentrations were double their pre "atomic age" values.
Nuclear bombs generate large numbers of high energy neutrons, which can in turn transmute nitrogen 14 into carbon 14 in exactly the same way as naturally occurring secondary cosmic rays.
Spallation reactions occur in minerals in the rocks upon bombardment by cosmic rays.
By sampling the rocks and separating certain minerals (such as quartz or pyroxene) and calculating the amount of these minerals (as a ratio to other, stable, minerals), we can work out how long the rock has been exposed on the earth’s surface.
This rare, unstable isotope is produced from ordinary nitrogen 14.
In earth's upper atmosphere, on the edge of what is commonly called outer space, light atomic nuclei from unknown sources outside of our solar system traveling at speeds approaching the speed of light called rain down continuously.
These isotopes are stable, which is why they are with us today, but unstable isotopes are also present in minute amounts.