Word: withdrawnness
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Dates: during 1960-1969
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...that-a 500-ton pile of carefully machined bricks made of pure graphite. Imbedded in some of the bricks, in a precisely calculated pattern, were little cubes of uranium or uranium oxide. Long control rods, plated with the metallic element cadmium, were so set up that they could be withdrawn from, or inserted into, deep holes in the graphite...
...there was to it. The operation of the pile depended on natural properties of 1) uranium, which normally emits neutrons at a steady rate, 2) graphite, which slows neutrons down but does not absorb them, and 3) cadmium, which absorbs neutrons very effectively. As the control rods were withdrawn-so the experimenters figured-fewer of the neutrons from the uranium would be absorbed, and therefore more fission would occur. At some point of withdrawal, fission would be producing new batches of neutrons faster than the cadmium would be absorbing them. Result: a chain reaction...
...Bottle of Chianti. Several times that morning, Fermi told Weil to pull the control rod out a little farther, six inches or a foot. Each time the radiation increased, only to level off again-still too much control rod. After lunch, Fermi ordered the rod withdrawn another foot. Again the radiation leveled off. Then another six inches. Still not enough. "Pull it out another foot," Fermi called. It was precisely...
...natural rebel who was in constant hot water with the directors of the Kirov school, Nureyev became increasingly withdrawn after his defection. He is continually harassed by Russian embassy officials who try to persuade him to return, and for a while his mother called him daily from Russia at Soviet government expense. Nureyev has no apartment of his own in London, in fact has little life of his own at all outside Covent Garden. Away from the dance, says a friend, "he's a monk...
...miles; 7,200-mile B-52s are sometimes deployed overseas temporarily, but most B-52s are based within the U.S. The U.S. missile force in Britain consists of some 60 Thor IRBMs under dual U.S.- British control. The U.S. has notified Britain that the missiles will be withdrawn next year. At Holy Loch, in Scotland, the Navy has its only foreign Polaris station...