Atmospheric Carbon

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Let me explain:
A. Cosmic rays from the sun strike Nitrogen 14 atoms in the atmosphere and cause them to turn into radioactive Carbon 14, which combines with oxygen to form radioactive carbon dioxide.
B. Living things are in equilibrium with the atmosphere, and the radioactive carbon dioxide is absorbed and used by plants. The radioactive carbon dioxide gets into the food chain and the carbon cycle.
C. All living things contain a constant ratio of Carbon 14 to Carbon 12. (1 in a trillion).
D. At death, Carbon 14 exchange ceases and any Carbon 14 in the tissues of the organism begins to decay to Nitrogen 14, and is not replenished by new C-14.
E. The change in the Carbon 14 to Carbon 12 ratio is the basis for dating.
F. The half-life is so short (5730 years) that this method can only be used on materials less than 70,000 years old. Archaeological dating uses this method
G. Assumes that the rate of Carbon 14 production (and hence the amount of cosmic rays striking the Earth) has been constant (through the past 70,000 years).
H. Carbon 14 equilibrium should be reached in 30,000 years from the beginning of earth's existence.

Summary: The atmospheric C-14 is presently only 1/3 of the way to an equilibrium value which will be reached in 30,000 years. This demonstrates that the earth is less than 10,000 years old.

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