Ключевые слова: alarm, alert, atom, attention, biological, black, caution, chemical, chemistry, compressed gas, contaminated, danger, danger sign radiation, dangerous, energy, hazard, icon, lab, laboratory, nuclear, pollution, prohibition, protect, protection, radiation, radiationsign clipart, radioactive, radioactivity, reactor, research, restricted, restriction, risk, safety, science, scientific, security, sign, sign symbol, signal, sticker radiationsign, symbol, toxic, toxic radiationsymbol, uranium, yellow,