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 Atomic Bomb Casualty Commission The Atomic Bomb Casualty Commission (ABCC) was a commission established in 1946 in accordance with a presidential directive from Harry S. Truman to the National Academy of Sciences-National Research Council to conduct investigations of the late effects of radiation among the atomic-bomb survivors in Hiroshima and Nagasaki. As it was erected purely for scientific research and study, not as a provider of medical care and also because it was heavily supported by the United States, the ABCC was generally mistrusted by most survivors and Japanese alike. It operated for nearly thirty years before its dissolution in