TY JOUR TI Radiation-Hygienic Monitoring in Potentially Radon-Hazardous Territories KW radon-222 KW volumetric activity KW EEVA KW potential radon hazard of territories KW categorization of territories KW residential and public buildings KW nuclear legacy objects JO Medical Radiology and radiation safety AU Laschenova, T.N. AU Karl, L.E. AU Marennyy, A.M. PY 2021 IS 66 PB Federal Medical Biological Agency of Russia