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carbon-12 (C), which makes up 99% of all carbon on Earth; carbon-13 (C), which makes up 1%; and carbon-14 (C), which occurs in trace amounts, making up about 1.2 atoms per 10 atoms of carbon in the atmosphere. C and C are both stable; C is unstable, with half-life years, decaying into nitrogen-14 through beta decay. Pure carbon-14 would have a molar activity of 62.4 mCi/mmol

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