Word: radiuses
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...Within a radius of one mile of Union Square (Ground Zero), the city would appear to have been struck by a giant fist. Within that radius would be the lofty Empire State Building, the Metropolitan Life Insurance Building; the teeming cliff dwellings of Peter Cooper Village and Stuyvesant Town; Klein's department store; 14th Street's subway complex; a labyrinth of gas mains, water lines, telephone cables, electric wires; 55 elementary schools, high schools and trade schools; 17 universities and private schools; twelve of the city's hospitals...
...bomb exploded 2,000 feet above the ground would do the greatest damage. Virtually everything within a radius of half a mile by ground zero will be destroyed or irreparably damaged by the blast, the heat, or by fires started by the heat. Within the next mile, countless fires will be started by the heat radiation. As many fires will be started by broken gas lines, electrical short circuits. Broken water lines will make fire-fighting almost impossible...
...half-mile radius, the gamma rays will be powerful enough, even after penetrating brick or concrete walls two feet thick, to kill or gravely injure people well protected from heat and blast. Beyond the half-mile radius, the rays' deadly power will decrease, gradually at first, then sharply; two miles from the explosion they will be virtually harmless...
...great majority (85% or more) of those in a half-mile radius from the burst will die. Most of these will be killed instantly by blast, heat or falling masonry. Others will get a fatal dose of radiation...
...feet of the burst, 80% died. At 4,500 feet the mortality rate was down to 50%, at 6,500 it was 15%. Some U.S. cities in business hours have 150,000 to 250,000 people in the four-fifths of a square mile covered by the half-mile radius. An air burst over them would kill many more than died at Hiroshima...