Fig. 8From: Low-radiation dose XRF excited by MeV protons for cultural heritage samplesRadiation dose to the azurite–gelatin mixture sample as a function of the azurite content (w/w). The number of incident primary X-ray photons was adjusted, such that the LODCu for both the analytical methods were equal (80 ppm). For reference, the azurite concentration of Sample #4 is indicated by a vertical dashed lineBack to article page