INSIDER UC2: the BR3 biological shield preliminary results and future work Wouter Broeckx, Bart Rogiers, Nico Mangelschots, Ronny Vandyck, Greet Verstrepen and Sven Boden EPJ Nuclear Sci. Technol., 6 (2020) 14 Published online: 30 March 2020 DOI: 10.1051/epjn/2019054