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A new portable macro X‐ray fluorescence scanner has been specifically designed for in situ, real‐time elemental mapping of large painted surfaces. This system allows scanning 80 × 80 × 20 cm3 along the X, Z, and Y directions, respectively, with adaptive beam size at the energy of the Rh Ka‐line. The detection system consists of a 50 mm2 active area detector coupled to a CUBE pre‐amplifier and to the...