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| big, living, carey, exercise, rolling fatties , fanman, gee, the fat man, magazine, chubby women , arcade, webcam, 2005, ussr, hip hop culture, hobby photography, online games, ohio, viruses, | The Reflector/Tamper The pit was surrounded by a natural uranium tamper weighing 120 kg, with a diameter of 23 bbw nude cm. The tamper formed a 7 cm thick layer around the pit. The thickness of this layer bbw nude was determined by neutron conservation considerations, since a few cm is sufficient to provide inertial confinement. Thicker natural uranium reflectors (exceeding 10 cm) provide significant additional savings to ordinary critical assemblies. But the "time absorption" effect inherent to fast exponential chain reactions reduced the benefits of a thicker reflector. About 20% of the bomb yield was bbw nude from fast fission of this tamper. The pit and the tamper together made a marginally subcritical system. When compressed by the implosion up to 2.5 times its original density (possibly somewhat less), the pit became an assembly of some 4-5 critical masses. |
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| Like the pit, the shell was formed in two halves by hot pressing in a nickel carbonyl atmosphere. The magazine surfaces of the shell and central sphere were coated with 0.1 mm of gold, and also a nickel layer deposited by the nickel carbonyl atmosphere. 50 curies polonium-210 (11 mg) was deposited on the grooves inside the shell and on the central sphere. The gold and nickel layers protected the beryllium magazine from alpha particles emitted by the polonium or surrounding plutonium. magazine The Urchin was attached to a mounting bracket inside the central cavity of the pit, which was probably 2.5 cm wide. The Urchin was activated by the arrival of the implosion shock wave at the center of the pit. When the shock wave reached the walls of the cavity, they vaporized and the plutonium gas shock wave then struck the initiator, collapsing the grooves and creating Munroe-effect jets that rapidly mixed the polonium and beryllium of the inner and outer spheres together. The alpha particles emitted by the Po-210 then struck beryllium atoms, periodically knocking loose neutrons, perhaps one every 5-10 nanoseconds. |
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