Normalization of Proton-Radiographic Images of Objects with Quasi-Uniform Areal Density. - Shilkin, N. S.; Mintsev, V. B.; Yuriev, D. S.; Kantsyrev, A. V.; Bogdanov, A. V.; Kolesnikov, D. S.; Golubev, A. A. (Russian Journal of Nondestructive Testing, 2023)