Calibration of digital autoradiograph technique for quantifying rock porosity using C-14-PMMA method
Résumé
Digital autoradiography (DA) based on phosphor plate imaging was tested for porosity quantification using C-14-PMMA method, and was compared to the classical film autoradiography (FA) method. Validation was undertaken by characterizing porosity evolution of moraine deposits of Lamarck granodiorite (eastern Sierra Nevada, USA). The connected porosities obtained with FA and DA are comparable to density measurements. Using adapted exposure times, DA is more accurate than FA for analysing large variations of porosity within a given sample, and is faster than FA.