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An isotope is an element with the same “atomic number” (number of protons) , but a different “atomic weight” ( protons neutrons electrons.) Some isotopes are stable, which means they don't change over time ( well… Regular Carbon, C-12 is the most common isotope of Carbon.Desmond Clark (1979) wrote that were it not for radiocarbon dating, "we would still be foundering in a sea of imprecisions sometime bred of inspired guesswork but more often of imaginative speculation" (Clark, 1979:7).Writing of the European Upper Palaeolithic, Movius (1960) concluded that "time alone is the lens that can throw it into focus"."Everything which has come down to us from heathendom is wrapped in a thick fog; it belongs to a space of time we cannot measure.We know that it is older than Christendom, but whether by a couple of years or a couple of centuries, or even by more than a millenium, we can do no more than guess." [Rasmus Nyerup, (Danish antiquarian), 1802 (in Trigger, 19)].

However, cosmic radiation constantly collides with atoms in the upper atmosphere.

This tendency to decay, called radioactivity, is what gives radiocarbon the name radiocarbon.

The atmosphere contains many stable carbon atoms and relatively few radiocarbon atoms.

The older the material, the less C-14 it will contain, as the C-14 will have decayed over time at a fairly regular rate. C-12 to C-14 ratios are somewhat variable in normal samples.

Plants take up Carbon as both isotopes, and incorporate that Carbon into their cells.

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