The calibration of an axial tomodensitometer, used in sedimentology, was carried out on minerals and liquid samples. This study, taking into consideration the interactions between X rays and matter, revealed (i) a good correlation between the density of samples containing elements with low atomic number, which undergo only Compton scattering, and the intensity readings obtained by computer tomography and (ii) readings higher than predicted by linear correlation for samples containing elements with high atomic number, which undergo both Compton scattering and photoelectric absorption. An empirical model is used to correct the readings and correlate them with the density.

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