NEUTRON FIELD MOCK-UP DEVELOPMENT FOR THE FLUORIDE SALT REACTORS NEUTRONIC RESEARCH Evžen Losa, Michal Košťál, Tomáš Czakoj, Jan Šimon, Nicola Burianová, Vlastimil Juříček and Vojtěch Rypar EPJ Web Conf., 247 (2021) 08013 Published online: 22 February 2021 DOI: 10.1051/epjconf/202124708013