Introduction to Radiocarbon Determination by the Accelerator Mass Spectrometry Method
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چکیده
There are three principal isotopes of carbon which occur naturally C, C (both stable) and C (unstable or radioactive). These isotopes are present in the following amounts C 98.89%, C 1.11%, and C 0.00000000010%. Thus, one carbon-14 atom exists in nature for every 1,000,000,000,000 or (1 in a trillion) carbon-12 atoms in living material. The radiocarbon method is based on the rate of decay of the radioactive or unstable carbon isotope 14 (C), which is formed in the upper atmosphere through the effect of cosmic ray neutrons upon nitrogen-14.
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