Trinity — The First Nuclear Detonation
The first nuclear weapon was detonated at 5:29 in the morning of 16 July 1945, at a site in the Jornada del Muerto desert in New Mexico that Robert Oppenheimer named Trinity after a Donne sonnet. The device, called the Gadget, was a plutonium implosion design — the harder of the two the Manhattan Project pursued, and the reason a test was needed at all. The uranium gun weapon used at Hiroshima was considered certain enough to be used untested; implosion required a shaped charge assembly to compress a subcritical sphere symmetrically in microseconds, and nobody knew whether it would work. The yield was about 21 kilotons, well above most predictions. Scientists had run a betting pool; Oppenheimer had guessed 300 tons. The fireball vaporised the steel tower, fused the desert sand into a green glass later called trinitite, and was seen 200 miles away. The Army announced that an ammunition magazine had exploded. Enrico Fermi estimated the yield by dropping torn paper as the blast wave passed and measuring how far it travelled. Kenneth Bainbridge said afterwards that they were all sons of bitches now. Oppenheimer said later that a line from the Bhagavad Gita came to him — that he was become death, the destroyer of worlds — though contemporaries recall nothing said at the time. Truman was at Potsdam and told Stalin days later that America had a new weapon. Stalin, who had known through espionage for years, said he hoped it would be used well. Hiroshima was bombed three weeks later and Nagasaki three days after that. Downwind communities in New Mexico were never warned, never studied, and were excluded from federal compensation until 2025.
- Year: 1945 CE
- Category: Technology
