Figure 2
From: Characterizing pearls structures using X-ray phase-contrast and neutron imaging: a pilot study
X-ray PC (a) and neutron (b) reconstructed image corresponding to the same slice of the natural pearl NP-22. Aragonite phases figure as white and dark grey zones in the X-ray and neutron images, respectively. Organic matter is recognized as dark grey and white zones in the X-ray and neutron images, respectively. In the neutron image an elevate concentration of organic matter has been identified, visible as white zones due to hydrogen presence. On the other hand, the X-Ray PC image shows with more details the concentric growth arcs and the layers of organic matter. Grey scale refers to refractive index decrement for PCI (a) and to linear attenuation coefficient (cm−1) for NI (b).
