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Heritage Science

Table 1 Superficial sensitivity of MA-rXRPD

From: Imaging secondary reaction products at the surface of Vermeer’s Girl with the Pearl Earring by means of macroscopic X-ray powder diffraction scanning

Compound name Chemical formula Miller indices (hkl) 2θ (°) ds (µm)
Palmierite K2Pb(SO4)2 (10-5) 28.42 9
Weddellite CaC2O4·2H2O (020) 14.31 30
Gypsum CaSO4·2H2O (021) 20.73 28
  1. The infinite thickness ds was calculated for three alteration compounds based on their most intense reflection hkl, an incident angle \(\gamma\) of 10°, the attenuation cross-section μ and the density \(\rho\), for monochromatic Cu-Kα radiation
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