therefore does not deflect incoming cosmic rays. Once the
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The technique was developed in the late 1940s at the University of Chicago by Willard Libby. It is based on the reality that radiocarbon (14C) is consistently being created within the Earth’s ambiance by the interaction of cosmic rays with atmospheric nitrogen. The resulting 14C combines with atmospheric oxygen to kind radioactive carbon dioxide, which is integrated into crops by photosynthesis; animals then acquire 14C by eating the plants.