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| sears tower, paul jeffreys, fatman (metal gear), fatman & little boy [import], 0974150002, constant weight, nuclear power, bgirl, daily, jalopnik, nostalgia, composer, box sets (audio only), dj equipment, alternative rap, muzzle velocity, natasha richardson, one liners, cache, nuclear science, hiroshima, | 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 core to properly detonate, greatly reducing the chances internet of an accidental nuclear detonation. The "Trinity" device was similar to internet the "Fat Man" bomb. Because of its complicated firing mechanism, and the need for previously untested synchronization of explosives and precision design, it was felt that a full test of the concept was needed before the scientists and military representatives could internet 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. |
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| Because of the presence of the isotope Pu-240, reactor-bred plutonium had a much higher rate paul jeffreys of spontaneous neutron emission than was previously thought, and if a gun-type device was used it would most likely pre-detonate and result in a messy and costly "fizzle". The spontaneous fission rate of Pu-240 is 415,000 fissions/(s·kg), and the amount was 0.9% of 6.2 kg, is 56 g. Thus there were 23,000 spontaneous fissions per second. This means that the last few centimeters would have to be travelled in preferably much less than 40 microseconds. It is paul jeffreys theoretically possible to paul jeffreys build a plutonium gun-type device, but it would need to be 19 feet long in order to allow the sub-critical masses to be fused into a critical mass before a fizzle occurs. The mass of a plutonium gun-type device would have been beyond the payload of the B-29. After this problem was realized in 1943, work began in earnest on the implosion bomb, the "Fat Man". The gun-type method could still be used for highly-enriched uranium, though, and was employed in the "Little Boy" weapon which was used against Hiroshima, Japan. |
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