Fig. 7
From: Multi-modal tomography to assess dechlorination treatments of iron-based archaeological artifacts
Bivariate histogram of nail B projected in the plan of the linear attenuation coefficient axes: neutrons vs X-ray before (a) and after (b) treatment. The histograms are distributed in two main axis that can be interpreted as gradients of concentration of chloride for the first and iron for the second. Most changes can be observed in a zone centered around \(1.5\) cm−1 for X-ray and \(1.5\)cm−1 for neutrons. a Before treatment, b after treatment