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cm game music wide. 15 parallel wedge-shaped grooves, each 2.09 mm deep, were cut into the inner surface of the shell. Like the pit, the shell was formed in two halves by hot pressing in a nickel carbonyl atmosphere. The surfaces of the shell and central sphere were coated with 0.1 mm of gold, and also a nickel game music layer deposited by the nickel carbonyl atmosphere. 50 curies polonium-210 (11 game music mg) was deposited on the grooves inside the shell and on the central sphere. The gold and nickel layers protected the beryllium from alpha particles emitted by the polonium or surrounding plutonium. 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.
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