Intense thermal heat emitted by the fireball caused severe burns and loss of eyesight. Thermal burns of bare skin occurred as far as 3.5 kilometers from ground zero. Most people exposed to thermal rays within 1-kilometer radius of ground zero died. Tile and glass melted; all combustible materials were consumed. An atomic explosion causes an enormous shock wave followed instanteneously by a rapid expansion of air called the blast these represent roughtly half the explosion's released energy. Maximum wind pressure of the blast 35 tons per square meter. People exposure within 500 meters of ground zero was fatal. People exposed at distances of 3 to 5 kilometers later showed symptoms of aftereffects, including radiation-induced cancers.
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