Monte Carlo simulation and unfolding of an extended Bonner sphere system for secondary neutron spectrometry in proton therapy facilities using conventional BSS experimental data. - Díaz-Comeche A; Oliver S; Juste B; Jardin D; Zakhary M; Mossahebi S; Mille MM; Lee C; Miró R; Verdú G; Morató S (Frontiers in oncology, 2026)