Ключевые слова: abstract, atom, atomic, background, badge, caution, contaminate, contaminated, danger, deterrent, disaster, energy, fission, green symbol, hazard, icon, nuclear, nuke, physics, plutonium, pollutant, pollution, radiation, radiation sign, radiation symbol, radioactive, radioactivity, reactor, research, roentgen, safety, science, sign, symbol, threat, uranium, warn,