Related by context. Frequent words. (Click for all words.) 51 Chernobyl catastrophe 47 depleted uranium DU 47 Kola Peninsula 47 Chernobyl 46 atmospheric CO2 concentrations 46 phosphorous bombs 45 radioactive fallout 45 unexploded shells 45 Chornobyl disaster 45 radionuclides 44 Chornobyl 44 radioactivity 44 becquerel 43 centigrade 43 marine sediments 43 unexploded mines 43 degree Centigrade 43 volcanic plume 43 radioactive substances 43 unexploded cluster bombs 42 depleted uranium munitions 42 Gamma rays 42 radioactive 42 degrees celcius 42 UXOs 41 spewed radiation 41 Bryansk region 41 Radioactive material 41 cluster bomblets 41 Dubna 40 radioactive cesium 40 Caesium 40 americium 40 Chernobyl reactor 40 radionuclide 40 #ppb [003] 40 Strong quake jolts 40 Agent Orange herbicide 40 radioactive byproducts 40 arsenic concentrations 40 Novgorod region 40 Quake jolts 40 Vorkuta 40 Semipalatinsk 40 atmospheric CO 39 Minister Sergei Shoigu 39 Kelud 39 meteoroid 39 Marburg fever 39 Depleted uranium 39 Volcano erupts 39 undersea volcanoes 39 isotope ratios 39 Arctic permafrost 39 Centigrade 39 radioactive material 39 cesium 39 ionised 39 radioactive materials 39 naturally occurring radioactive 39 aerosol particles 39 Kamchatka peninsula 39 radioactive particles 38 vaporise 38 Dimona nuclear 38 mg/m3 38 landmines planted 38 degrees Celsius 38 radioactive contamination 38 electron density 38 Soil samples 38 Zapadnaya mine 38 Nitrogen oxides 38 insurgent ambushes 38 Sulfur dioxide 38 Chernihiv 38 Zasyadko mine 38 steam vents 38 radioactive plume 38 ecological catastrophe 38 megatons 38 isotope separation 38 radioactive decay 38 Chernobyl disaster 38 degrees centigrade 38 Litvinenko poisoning 38 seismicity 38 neighboring prefectures 38 kiloton nuclear 37 Radiation leaks 37 ozone depletion 37 Tunguska 37 degree Celsius 37 alpha particle 37 microsievert 37 airborne pollutants 37 precipitations 37 dioxin 37 incendiary bombs 37 ultra violet radiation 37 Ramat Hovav