Debt of Honor - Tom Clancy [54]
Inside was something else. Although the two external security points were staffed by smiling men who politely gave directions to disoriented motorists, inside the building it was something else entirely. Each security desk featured hidden attachments which held German-made P-38 pistols, and the guards here didn't smile much. They didn't know what they were guarding, of course. Some things were just too unusual to be recognized. No one had ever produced a TV documentary on the fabrication of nuclear devices.
The shop floor was fifty meters long by fifteen wide, and there were two evenly spaced rows of machine tools, each of them enclosed with Plexiglas. Each enclosure was individually climate-controlled by a separate ventilation system, as was the room as a whole. The technicians and scientists wore white coveralls and gloves not unlike those required of workers in a computer-chip plant, and indeed when some of them stepped outside for a smoke, passersby took them for exactly that.
In the clean room, roughly shaped plutonium hemispheres came in at one end, were machined into their final shapes at several stages, and emerged from the other end so polished they looked like glass. Each was then placed in a plastic holder and hand-carried out of the machine shop to the storage room, where each was set on an individual shelf made of steel covered with plastic. Metal contact could not be allowed, because plutonium, in addition to being radioactive, and warm due to its alpha-radiation decay, was a reactive metal, quick to spark on contact with another metal, and actually flammable. Like magnesium and titanium, the metal would burn with gusto, and, once ignited, was the very devil to extinguish. For all that, handling the hemispheres—there were twenty of them—became just one more routine for the engineers. That task had long since been completed.
The harder part was the RV bodies. These were large, hollow, inverted cones, 120 centimeters in height and 50 across at the base, made of uranium-238, a darkly reddish and very hard metal. At just over four hundred kilograms each, the bulky cones had to be precisely machined for absolute dynamic symmetry. Intended to "fly" after a fashion, both through vacuum and, briefly, through air, they had to be perfectly balanced, lest they become unstable in flight. Ensuring that had to everyone's surprise turned out to be the most difficult production task of all. The casting process had been reordered twice, and even now the RV bodies were periodically rotated, similar to the procedure for balancing an automobile tire, but with far more stringent tolerances. The exterior of each of the ten was not as finely machined as the parts that went inside, though they were smooth to the ungloved touch. Inside was something else. Slight but symmetrical irregularities would allow the "physics package"—an American term—to fit in snugly, and, if the moment came—which everyone hoped it would not, of course—the enormous flux of high-energy "fast" neutrons would attack the RV bodies, causing a "fast-fission" reaction, and doubling the energy released by the plutonium, tritium, and lithium deuteride within.
That was the elegant part, the engineers thought, especially those unfamiliar with nuclear physics who had learned the process along the way. The U-238, so dense and hard and difficult to work, was a highly refractory metal. The Americans even used it to make armor for their tanks, it resisted external energy so well. Screeching through the atmosphere at 27,000 kilometers per hour, air friction would have destroyed most materials, but not this one, at least