TY JOUR TI CHERNOBYL DISASTER CONSEQUENCES 30 YEARS LATER KW Chernobyl disaster KW radioactive contamination density KW cesium-137 KW strontium-90 KW americium-241 KW state of population health KW the government resolution №1074 JO Bulletin of Bryansk state technical university AU Korsakov, A.. AU Komogortseva , L.. PY 2017 IS 2017 PB Bryansk State Technical University