Ключевые слова: active, alarm, alert, atom, atomic, beware, caution, chemical, chemistry, contaminate, contaminated, danger, dangerous, disaster, energy, fission, hazard, hazardous, illustration, irradiation, label, nuclear, plutonium, pollutant, pollution, power, radiation, radio, radioactive, radioactivity, ray, research, risk, safety, toxic, triangle, triangular, unusual, uranium, warn, warning,