What is the difference between carbon dating and thermoluminescence

The reported TL intensity of aragonite is considerably weaker than that of calcite.Unlike a grating dispersive spectrometer, which has small optical throughput because an entrance slit is necessary to resolve the spectrum, a FTS can realize a large optical throughput because it uses an interferometer and no slit is necessary.The observed interferogram was converted to a TL spectrum by fast Fourier transformation.

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We used a TL spectrometer with a Fourier-transform detector to detect the calcite component in TL spectra of powdered skeletons of modern and fossil corals (from 127 ka and 3.5 Ma) in which calcite was not detectable by XRD.Thus, for reconstructing paleo-El Niño events in tropical regions, for instance, detection of subpercentage levels of secondary calcite is crucial because El Niño events are defined by a temperature anomaly in the Niño 3.4 region of more than 0.5 °C.In particular, the partition coefficient of manganese in calcite is greater than unity, whereas in aragonite it is less than unity.Thus, the TL spectroscopic technique is a highly sensitive tool for screening fossil corals for diagenetic alteration.and foraminifer tests that have been altered by diagenesis over very long periods lose their original paleoenvironmental information.

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    The good dates are confirmed using at least two different methods, ideally involving multiple independent labs for each method to cross-check results.