Nuclear explosion debris. The first man made nuclear explosion occurred on July 16, 1945 at 5:50 am on the Trinity Test Site near Alamogordo, New Mexico in the United States, an area now known as the White Sands Missile Range. The event involved the full-scale testing of an implosion-type fission atomic bomb. In a memorandum to the U.S. Secretary of War, General Leslie Groves describes the yield as equivalent to 15,000 to 20,000 tons of TNT. Following this test, a uranium-gun type nuclear bomb (Little Boy) was dropped on the Japanese city of Hiroshima on August 6, 1945, with a blast yield
Atomic Bomb Casualty Commission themselves with the procedures of the Japanese military. They visited Hiroshima and Nagasaki to see what work was being done. They found that the Japanese had a well-organized medical group under the Japanese National Research Council, who were carrying out studies on both immediate and delayed atomic bomb damage in survivors. It’s almost impossible to get an exact figure of how many people were killed in the two bombings, because both cities had people who had evacuated since it was a time of war. Hiroshima expected bombings, since they were an important military supply center, so many people had left