Nagasaki (Japan): 9 August 1945.
Nagasaki (Japan), 9 August 1945
There have only been two. So far. The first was Hiroshima.
The first use of plutonium was as nuclear weapon; United States was the first country to use these weapons against Japan.
It was used first for plutonium production for military purposes.
The first nuclear reaction used to obtain plutonium:238U + n-------239U-------239Np + e--------239Pu + e
The first step is an alpha decay to (guess what!) uranium 235. You can probably take it from there.
Uranium-238 is converted to plutonium-239 in nuclear reactors by absorbing neutrons, which then undergo fission reactions. This conversion process is a key aspect of nuclear reactor operation, particularly in breeder reactors where new fuel is produced while generating energy.
Nagasaki (Japan), 9 August 1945
The UK was the third country to obtain nuclear weapons, after the US and the USSR. The UK had its first successful nuclear weapon test in October 1952, a plutonium warhead similar to the one dropped on Nagasaki.
The atomic bomb tested at the Trinity test site in New Mexico during World War II was a plutonium-based implosion-type bomb known as "Gadget." This test marked the first detonation of a nuclear weapon.
Plutonium was prepared for the first time in December 1940 at Berkeley Laboratory by Glenn Seaborg and collaborators using this nuclear reaction:U-238 + D........Np-238 + 2 n.........Pu-238 + e-