Since the bombardment is slightly variable, and for other reasons, the 14C taken into organic matter is also slightly variable. The impact of the radiocarbon dating technique on modern man has made it one of the most significant discoveries of the 20th century.
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How Does Radiocarbon Dating Work? - Instant Egghead #28
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In the 19th and early 20th century incredibly patient and careful archaeologists would link pottery and stone tools in different geographical areas by similarities in shape and patterning. He is credited to be the first scientist to suggest that the unstable carbon isotope called radiocarbon or carbon 14 might exist in living matter. Studies such as this are fundamental to determining not just how the environment has changed thanks to human manipulation, but also to natural changes due to fluctuations in the environment and climate. For instance, the amount varies according to how many cosmic rays reach Earth. Carbon 14 is continually being formed in the upper atmosphere by the effect of cosmic ray neutrons on nitrogen 14 atoms. Since the bombardment is slightly variable, and for other reasons, the 14C taken into organic matter is also slightly variable. Radiocarbon dating is profoundly useful in archaeology, especially since the dawn of the even more accurate AMS method when more accurate dates could be obtained for smaller sample sizes. Around 55, years later, so much 14C has decayed that what remains can no longer be measured. It also has some applications in geology; its importance in dating organic materials cannot be underestimated enough.
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