TY JOUR TI Study of the effectiveness of protection against gamma radiation using a multilayer hemispherical screen KW gamma radiation KW protection KW screen KW shielding KW multilayer screens KW accumulation effect KW activation radioactivity KW mod-eling KW photoelectric effect KW Compton effect KW electron-positron pair formation KW direct interaction with the nucle-us KW materials for protection against gamma radiation KW at-tenuation coefficient KW secondary radiation KW intensity KW radia-tion sources. JO Modeling of systems and processes AU Poluektov, A.V. AU Zarevich, A.I. AU Makarenko, F.V. AU Solodilov, M.V. PY 2025 IS 18 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov