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The colleague who nominated him noted: “Seldom has a single discovery in chemistry had such an impact on the thinking of so many fields of human endeavour.
Libby compared C14 samples from wood in an Egyptian tomb with that from living trees to determine the half-life of C14.
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Three types of carbon occur naturally in living material: C12, C13 and C14.
Carbon14 (C14) is unstable and present in a very small percentage relative to the other components.