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Ratios of the IR intensities of the ν 2[B] (880 cm−1) and ν 2[A] (870 cm−1) CO3 modes to the ν 1 PO4 (960 cm−1) mode. Squares mark the B-type and open circles the A-type carbonate substitutions. An estimate of the relative carbonate content in human dental apatite as a function of the tooth-age is provided by these ratios. The lines are guides to the eyes.
