Study of online measurements techniques of metallic phase spatial distribution into a corium pool D. Tisseur, M. Cavaro, F. Rey, K. Paumel, N. Chikhi, J. Delacroix, P. Fouquart, R. Le Tellier and V. Bouyer EPJ Web Conf., 225 (2020) 08003 Published online: 20 January 2020 DOI: 10.1051/epjconf/202022508003