Hiroshima 1938, Photograph by Wakaji Matsumoto, Courtesy of Hitoshi Oouchi. October 5, 1945, Photograph by Shigeo Hayashi, Courtesy of Hiroshima Peace Memorial Museum. At 8:15 a.m. on the morning of August 6, 1945, an atomic bomb was dropped on Hiroshima. The exploding bomb sent out nuclear radiation (neutrons and gamma rays), shock waves from the blast, and thermal radiation (heat waves). It killed and destroyed almost everything within 2 kilometers (1.3 miles) from the blast center. At the end of that day, according to the Japan-US Joint Research Group, 45,000 people were dead. And people kept dying, both from their wounds and from radiation poisoning. By the end of the year, more than 140,000 people had died, and tens of thousands more continued to suffer from the effects of the bomb. Before the Bombing After the Bombing