Characterization of the X-ray spectrum of a linear accelerator Maëva Maulin, Pierre Guy Allinei, Daniel Eck, Nicolas Estre, Emmanuel Payan, David Tisseur and Grégoire Kessedjian EPJ Web Conf., 253 (2021) 04002 Published online: 19 November 2021 DOI: 10.1051/epjconf/202125304002