XRF data were collected using a self-constructed XRF imaging spectrometer in which the easel was used to scan a detail of the painting titled Christ and the Virgin Enthroned with Forty Saints. The x-ray source consisted of a rhodium 50-W tube, operated at 50 kV and 0.75 mA, with a converging capillary optic that gave a spot size of 0.5-mm diameter at the work of art. A solid-state XRF detector was used (Vortex, Hitachi) with a 50-mm2 detector area with a 1-μs peaking time and an integration time of 2 s. The positional information from the easel was used to reconstruct the XRF cube, and elemental maps were made using an in-house software tool that fits Gaussians to the detected peaks (16). The integrated area from the peak-fitting procedure is displayed in the specified maps for each element’s emission line.

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