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For a variety of reasons, the implosion method is both more efficient than the gun-type method, and also far safer, as a perfect synchronization of the explosion lenses is required for the what makes a fat man core to properly detonate, greatly reducing the chances of an accidental nuclear detonation. The "Trinity" device was similar to the "Fat Man" bomb. Because of its complicated firing mechanism, and the need for previously untested synchronization what makes a fat man of what makes a fat man explosives and precision design, it was felt that a full test of the concept was needed before the scientists and military representatives could be confident it would perform correctly under combat conditions. On July 16, 1945, a device utilizing a similar mechanism (called the "gadget" for security reasons) detonated in a test explosion at a remote site in New Mexico, known as the "Trinity" test. In the end, it gave somewhere around 20 kt (80 TJ), 2 to 4 times the expected yield. The Soviet Union's first nuclear weapon detonated at Operation First Lightning (known as "Joe 1" in the West) was more or less a purposeful copy of the "Fat Man" device, on which they had obtained detailed information from the spy Klaus Fuchs.
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