The sum of all fears - Tom Clancy [253]
"How much are we losing?" Ghosn asked.
"Oh, the total will be less than twenty grams," Fromm estimated. "It's nothing to worry about." Fromm looked at another gauge, the one that measured relative pressures. The machine tool was totally isolated from the rest of the room, with the pressure inside its enclosure marginally less than outside. The fact that argon gas was heavier than air would keep oxygen away from the plutonium. That prevented possible combustion. Combustion would generate plutonium dust, which was every bit as lethal as Fromm had told them. A toxic heavy metal, the additional hazard of radioactivity - mainly low-energy alphas - merely made death more rapid and marginally less pleasant. The machinists moved in to take over supervision of the process. They had worked out extremely well, Fromm thought. The skills they'd brought with them had grown with remarkable speed under his tutelage. They were nearly as good as the men he'd trained in Germany, despite their lack of formal education. There was much to be said for practical instead of theoretical work.
"How long?" Qati asked.
"How many times do I have to tell you? We are precisely on schedule. This phase of the project is the most time-consuming. The product we are now producing must be perfect. Absolutely perfect. If this part of the device fails to function, nothing else will."
"That's true of everything we've done!" Ghosn pointed out.
"Correct, my young friend, but this is the easiest thing to get wrong. The metal is hard to work, and the metallic phase transformations make it all the more delicate. Now, let's see those explosive blocks."
Ghosn was right. Everything had to work. The explosives had been almost entirely his problem after Fromm had set the design specifications. They'd taken normal TNT and added a stiffener, a plastic that made the material quite rigid, but without affecting its chemical properties. Normally explosives are plastic and easily malleable by their nature. That property had to be eliminated, since the shape of the blocks was crucial to the way in which their explosive energy was delivered. Ghosn had shaped six hundred such blocks, each a segment of a full ellipsoid. Seventy of them would nest together exactly, forming an explosive ring with an outside diameter of 35 centimeters. Each block had a squib fired from kryton switches. The wires leading from the power supply to the switches all had to be of exactly the same length. Fromm lifted one of the blocks.
"You say that these are all identical?" Fromm asked.
"Completely. I followed your directions exactly."
"Pick seventy at random. I'll take one of the stainless-steel blanks, and we will test your work."
The spot was already prepared, of course. It was, in fact, the eroded crater from an American-made Mark 84 bomb dropped by an Israeli F-4 Phantom some years before. Qati's men had erected a pre-fabricated structure of timber posts and beams whose roof was three layers of sandbags. Camouflage netting had been added to reduce the chance of notice. Test assembly took three hours, and an electronic strain-gauge was inserted in the steel blank and a wire run to the next crater down - two hundred meters away - where Fromm waited with an oscilloscope. They were finished just before dusk.
"Ready," Ghosn said.
"Proceed," Fromm replied, concentrating on his scope.
Ibrahim pressed the button. The structure disintegrated before their eyes. A few sandbags survived, flying through the air, but mainly there was a shower