Robert A Heinlein. Blowups Happen
Robert A Heinlein. Blowups Happen
“PUT down that wrench!”
The man addressed turned slowly around and faced the speaker. His expression was hidden by a grotesque helmet, part of a heavy, lead-and-cadmium armor which shielded his entire body, but the tone of voice in which he answered showed nervous exasperation.
“What the hell’s eating on you, doc?” He made no move to replace the tool in question.
They faced each other like two helmeted, arrayed fencers, watching for an opening. The first speaker’s voice came from behind his mask a shade higher in key and more peremptory in tone. “You heard me, Harper. Put down that wrench at once, and come away from that ‘trigger’. Erickson!”
A third armored figure came from the far end of the control room. “What ‘cha want, doe?”
“Harper is relieved from watch. You take over as engineer-of-the-watch. Send for the standby engineer.”
“Very well.” His voice and manner were phlegmatic, as he accepted the situation without comment. The atomic engineer whom he had just relieved glanced from one to the other, then carefully replaced the wrench in its rack.
“Just as you say, Doctor Silard, but send for your relief, too. I shall demand an immediate hearing!” Harper swept indignantly out, his lead-sheathed boots clumping on the floorplates.
Doctor Silard waited unhappily for the ensuing twenty minutes until his own relief arrived. Perhaps he had been hasty. Maybe he was wrong in thinking that Harper had at last broken under the strain of tending the most dangerous machine in the world-the atomic breeder plant. But if he had made a mistake, it had to be on the safe side-slips must not happen in this business; not when a slip might result in atomic detonation of nearly ten tons of uranium-238, U-235, and plutonium.
He tried to visualize what that would mean, and failed. He had ‘been told that uranium was potentially twenty million times as explosive as T.N.T. The figure was meaningless that way. He thought of the pile instead as a hundred million tons of high explosive, or as a thousand Hiroshimas. It still did not mean anything. He had once seen an A-bomb dropped, when he had been serving as a temperament analyst for the Air Forces. He could not imagine the explosion of a thousand such bombs; his. brain balked. Perhaps these atomic engineers could. Perhaps, with their greater mathematical ability and closer comprehension of what actually went on inside the nuclear fission chamber, they had some vivid glimpse of the mind-shattering horror locked up beyond that shield. If so, no wonder they tended to blow up- He sighed. Erickson looked away from the controls of the linear resonant accelerator on which he had been making some adjustment.
“What’s the trouble, doc?”
“Nothing. I’m sorry I had to relieve Harper.”
Silard could feel the shrewd glance of the big Scandinavian. “Not getting the jitters yourself, are you, doc? Sometimes you squirrel-sleuths blow up, too-”
“Me? I don’t think so. I’m scared of that thing in there-I’d be crazy if I weren’t.”
“So am I,” Erickson told him soberly, and went back to his work at the controls of the accelerator. The accelerator proper lay beyond another shielding barrier; its snout disappeared in the final shield between it and the pile and fed a steady stream of terrifically speeded up sub-atomic bullets to the beryllium target located within the pile itself. The tortured beryllium yielded up neutrons, which shot out in all directions through the uranium mass. Some of these neutrons struck uranium atoms squarely on their nuclei and split them in two. The fragments were new elements, barium, xenon, rubidium-depending on the portions in which each atom split. The new elements were usually unstable isotopes and broke down into a, dozen more elements by radioactive disintegration in a progressive reaction.
But these second transmutations were comparatively safe; it was the original splitting of the uranium nucleus, with the release of the awe-inspiring energy that bound it together-an incredible two hundred million electron volts-that was important-and perilous.
For, while uranium was used to breed other fuels by bombarding it with neutrons, the splitting itself gives up more neutrons which in turn may land in other uranium nuclei and split them. If conditions are favorable to a progressively increasing reaction of this sort, it may get out of hand, build up in an unmeasurable fraction of a micro-second into a complete atomic explosion-an explosion which would dwarf an atom bomb to pop-gun size; an explosion so far beyond all human experience as to be as completely incomprehensible as the idea of personal death. It could be feared, but not understood.