Word: grounds
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Dates: during 1960-1969
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...desperate Defense Department turned for help to the Sandia Laboratory in Albuquerque, which conducts bomb-electronics research for the AEC. Sandia scientists promptly requested all available accident data from the task force. With other experts, they pored over interviews with surviving B-52 crew members and witnesses on the ground; they studied Air Force wind-velocity records and the ballistic characteristics and impact points of the three recovered H-bombs. By feeding complex equations into computers, they projected trajectories backward from the impact points and established the precise location of the collision-the point from which the missing bomb began...
...fallen freely to the land below, or been carried far out to sea on its parachute? To simulate a mid-air breakup, the scientists dropped bomb parts from a high-flying plane at White Sands Missile Range, then photographed the craters made by the parts as they hit the ground. The pictures were rushed to Palomares, where searchers looked in vain for similar patterns on Spanish soil...
...thin slices of copper-nickel alloy. Now another Government agency has suggested a more direct solution: find more silver. To aid prospectors, U.S. Geological Survey scientists have designed and successfully tested a "silver snooper," a device capable of locating silver deposits buried as deep as three feet below the ground. By shooting a stream of neutrons into the earth, the snooper turns the silver temporarily radioactive, causing it literally to signal its presence...
...primitive type of particle accelerator. A beam of deuterium (or heavy hydrogen) particles emitted by the generator is directed against deuterium absorbed in a titanium target. As the deuterium particles collide, they release neutrons that are channeled into a beam that can cover a two-square-foot area of ground. The entire device, including the recording instruments, is small and light enough to be carried in the back of a Jeep. It has already been given trials in the field...
...such test, the snooper successfully detected silver ore particles that scientists had "seeded" in the ground at Greenbelt, Md. In another test, near Mineral, Va., the snooper determined that natural deposits of silver in an old zinc-mining area were too small to exploit economically. Geological Survey Physicist Frank Senftle, who headed the group that developed the snooper, believes that commercial models can be available for use as early as this fall, at a cost of between $25,000 and $35,000 per unit...