The principal initial effects are blast and radiation. Blast Defined as the brief and rapid movement of air away from the explosion's center and the pressure accompanying this movement. Strong winds accompany the blast. Blast hurls debris and personnel, collapses lungs, ruptures eardrums, collapses structures and positions, and causes immediate death or injury with its crushing effect. The heat and light radiation a nuclear explosion's fireball emits.
Light radiation consists of both visible light and ultraviolet and infrared light.
Thermal radiation produces extensive fires, skin burns, and flash blindness. Nuclear Radiation Nuclear radiation breaks down into two categories-initial radiation and residual radiation. Initial nuclear radiation consists of intense gamma rays and neutrons produced during the first minute after the explosion. This radiation causes extensive damage to cells throughout the body. Radiation damage may cause headaches, nausea, vomiting, diarrhea, and even death, depending on the radiation dose received.