Fig. 10
From: Multi-modal tomography to assess dechlorination treatments of iron-based archaeological artifacts
Spatial distribution of the materials found in predefined zones of the bivariate histogram of nail B. Using the bivariate histogram, it is possible to define regions of linear attenuation coefficients. Then, voxels with values of linear coefficients included in these regions can be found in the images, allowing to associate the regions in the bivariate histogram to material in the nails. Yellow corresponds to residual soil material, red corresponds to material with high chloride and/or high hydrogen density and orange corresponds to a mix of material. Blue is the uncorroded iron core. Violet is the zone of interest where the strongest effects of the treatment have been observed. a Bivariate histogram, b Neutron, c X-ray, d Phases