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cm thick, the solid inner sphere was prairie home companion 0.8 cm 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 layer deposited by the prairie home companion nickel prairie home companion 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 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.
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