TY JOUR TI METHODOLOGICAL APPROACH TO SOLVING THE PROBLEM OF SUBSTANTIATING THE RATIONAL PARAMETERS OF THE RADIATION MONITORING SYSTEM FOR DETECTING LOCAL SOURCES OF IONIZING RADIATION OF TERRORIST ORIGIN KW emercom KW closed city KW radiation KW radiation control KW ionizing radiation KW gamma radiation KW nuclear industry KW radioecology KW nuclear terrorism KW nuclear weapons JO Siberian Fire and Rescue Bulletin AU Mazanik, A.I. AU Valuev, N.P. AU Sergeev, I.Y. AU Nikolaev, G.A. PY 2021 IS 2021 PB FSBEE HE Siberian Fire and Rescue Academy EMERCOM of Russia