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Because all living things contain Carbon and a small portion of that Carbon is the radioactive isotope Carbon14.
There would be little point in using other radio active isotopes which aren't naturally present in things which need to be dated.
First deuterium and tritium (hydrogen isotopes) are put in.
Not surprisingly, he is also dealing with some zoning issues with the city.
Naturally occurring aluminum will have 14 neutrons in it.
There is only the one stable isotope of this element.
Isotopes are variants of a particular chemical element which differ in neutron number, although all isotopes of a given element have the same number of protons in each atom.
Isotope Variation Analysis (detection of adulteration in food products or the geographic origins of products using isoscapes) and Isotopic substitution (to determine the mechanism of a chemical reaction via the kinetic isotope effect) are the most frequently used application for isotopes. You can actually use both; the problem with symmetric encryption is how to get the shared key to someone else in a secure manner.