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The fission tracks produced by this process are recorded in the plastic film.
The different elements of the carbon exchange reservoir vary in how much carbon they store, and in how long it takes for the 14 C generated by cosmic rays to fully mix with them.
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Precise dating has been can be dated directly by radiometric and shale are related to the radiometric time scale by bracketing them within time.
Any 14 C signal from the machine background blank is likely to be caused either by beams of ions that have not followed the expected path inside the detector, or by carbon hydrides such as 12 CH 2 or 13 CH.
The radiation causes charge to remain within the grains in structurally unstable "electron traps".
The resolution the receptor who invented radiometric dating also a factor, but modern equipment is greatly improved on previous editions.