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The first target of nuclear weapons, the Mark I atomic bomb. The target was the Aioi Bridge across the Ōta River; it exploded several hundred yards off. Hiroshima was a city of 250,000, suffering 70,000 or so deaths immediately and up to 126,000 by the end of the year. Nagasaki, Japan
Scientists at the Los Alamos Laboratory calculated that a plutonium bomb would require a neutron initiator. The best-known neutron sources used radioactive polonium and beryllium, so Thomas undertook to produce polonium at Monsanto's laboratories in Dayton. While most Manhattan Project activity took place at remote locations, the Dayton Project ...
Portsmouth Gaseous Diffusion Plant is a facility located in Scioto Township, Pike County, Ohio, just south of Piketon, Ohio, that previously produced enriched uranium, including highly enriched weapons-grade uranium, for the United States Atomic Energy Commission (AEC), the U.S. nuclear weapons program and Navy nuclear propulsion; in later years, it produced low-enriched uranium for fuel for ...
Non-nuclear detonation of an atomic bomb A USAF B-50 aircraft on a training mission from Biggs Air Force Base with a Mark 4 nuclear bomb (minus a fissile core) flew into the ground resulting in a high-explosive detonation, but no nuclear explosion. The cause of the accident could not be established; the aircraft gave no signals of distress, and ...
The atomic bomb explosion generated a windstorm several kilometers wide that carried ash, dust, and debris over the mountain ranges surrounding Nagasaki. Approximately 20 minutes after the bombing, a black rain with the consistency of mud or oil came down carrying radioactive material for one to two hours before turning clear. [227]
The Hiroshima Peace Memorial (広島平和記念碑, Hiroshima Heiwa Kinenhi), originally the Hiroshima Prefectural Industrial Promotion Hall, and now commonly called the Genbaku Dome, Atomic Bomb Dome or A-Bomb Dome (原爆ドーム, Genbaku Dōmu), is part of the Hiroshima Peace Memorial Park in Hiroshima, Japan and was designated a UNESCO World Heritage Site in 1996.
Hiroshima Peace Memorial Park (広島平和記念公園, Hiroshima Heiwa Kinen Kōen) is a memorial park in the center of Hiroshima, Japan.It is dedicated to the legacy of Hiroshima as the first city in the world to suffer a nuclear attack at the end of World War II, and to the memories of the bomb's direct and indirect victims (of whom there may have been as many as 140,000).
This crash project was developed partially with information obtained via the atomic spies at the United States' Manhattan Project during and after World War II. The Soviet Union was the second nation to have developed and tested a nuclear weapon. It tested its first megaton-range hydrogen bomb ("RDS-37") in 1955.