Ключевые слова: alarm, alert, art, atom, atomic, caution, danger, dangerous, energy, gray, hazard, icon, illustration, isolated, laboratory, medical, medicine, nuclear, plutonium, pollution, power, protect, protection, radiation, radioactive, radioactivity, reactor, red, research, risk, roentgen, round, safety, science, sign, sky, symbol, uranium, war, warning, waste, waves, weapon, white, x ray, yellow,