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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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