Related by context. Frequent words. (Click for all words.) 55 radioactivity 55 radiation 53 radioactive contamination 51 crippled Fukushima nuclear 51 microsieverts 51 millisieverts 50 radiation exposure 49 radioactive substances 48 Fukushima reactor 48 radioactive 47 radioactive steam 47 Hidehiko Nishiyama 47 radiation emitted 46 reactor containment 46 Fukushima Daiichi 46 Fukushima Daiichi plant 46 radiation leaks 46 Radioactivity 45 Fukushima Daiichi nuclear 44 gamma radiation 44 Fukushima nuclear 44 Fukushima Dai Ichi 44 Radiation 44 reactor cores 44 radioactive cesium 44 Edano 43 TEPCO 43 Fukushima plant 43 radioactive material 43 spokesman Hidehiko Nishiyama 43 radioactive tritium 43 radioactive iodine 43 radiations 43 Secretary Yukio Edano 42 Co TEPCO 42 radioactive materials 42 Fukushima Dai ichi 42 Kashiwazaki Kariwa nuclear 42 radiological 42 radioactive leaks 42 ionizing radiation 41 trillion electron volts 41 partial meltdown 41 tritium 41 radioactive isotopes 41 radioactive particles 41 radionuclides 41 cesium 41 Japan Meteorological Agency 41 Radioactive iodine 41 mSv 40 cosmic radiation 40 Fukushima Daiichi Nuclear 40 radiation poisoning 40 Fukushima 40 cosmic rays 40 picocuries per 40 radionuclide 40 becquerels 40 radioactive fallout 40 contamination 40 Iitate 39 noxious gases 39 Tritium 39 reactor 39 Tuwaitha 39 nuclear 39 spokesman Yukio Edano 39 leaking radiation 39 vapor cloud 39 weaponisation 39 detonation 39 Fukushima reactors 39 public broadcaster NHK 38 millirems 38 electromagnetic radiation 38 AERB 38 detonations 38 gamma rays 38 mushroom clouds 38 Radioactive 38 atomic 38 electromagnetic fields 38 Geiger counter 38 toxic gases 38 Tokyo Electric 38 asbestos contamination 37 plutonium 37 Yukio Edano 37 Jaczko 37 seismic activity 37 poisonous gases 37 plumes 37 irradiated 37 ppm 37 Public broadcaster NHK 37 Minister Jaime Manalich 37 plume 37 Hamaoka plant 37 atomic bombs 37 Nuclear Regulatory Commission