Production of monochromatic -sources for detector characterizationM. Biassoni, C. Brofferio, S. Dell’Oro, L. Gironi, M. Nastasi and M. SistiEur. Phys. J. Plus, 137 12 (2022) 1309DOI: https://doi.org/10.1140/epjp/s13360-022-03519-4