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Updated: April 30, 2025
From the far horizon of the asteroid the incandescent fire of the nuclear blast stretched into space, turning from silver to orange to red as it cooled. Rip knew they had escaped the heat and blast of the explosion, but there was a question of how much of the prompt radiation they had absorbed. During the first few seconds, a nuclear blast vomited gamma radiation and neutrons in all directions.
Neutrons aren't used in any process I've run across." "Well, remember they're uncharged, tiny things. Small as protons, but without electric field. The result is they pass right through an ordinary atom without being stopped unless they make a direct hit. Tungsten, while it has a beautifully high melting point, is mostly open space, and a neutron just sails right through it, or any heavy atom.
Trudeau arrived with a long pole he had made by lashing two crate sticks together. Rip gave directions as they formed a cylinder of nuclite. Kemp spot-welded it, and they pushed it into the hole, forming a lining. Nunez found a small piece of material in one of the earlier craters. It would provide some neutrons to start the chain reaction.
You can't use solid hydrogen, because that melts too easily. Water can be turned into steam too easily, and requires more work. Paraffin is a solid that's largely hydrogen. That's what they've always used on neutrons since they discovered them. Confine your paraffin between tungsten walls, and you'll stop the secondary protons as well as the neutrons." "Hmmm I suppose so.
Rick explained on the way back to the farm. "There are four main kinds of radioactivity. They're called alpha, beta, gamma, and neutrons. Our sample has alpha and gamma. That means it doesn't come from either bomb debris or from a reactor, because fission takes place in both, and there is almost always beta activity as well as gamma in the products of fission.
The control officer called, "I have it centered, sir. We'll reach it in about an hour at this speed." "Jack it up," O'Brine ordered. "Heave some neutrons into it. Double speed, then decelerate to reach it in thirty minutes." The control officer issued orders to the engine control room. In a moment acceleration plucked at them. O'Brine motioned to Rip. "Come on, Foster.
"Radioactivity's still almost active-normal about eight hundred REM's and the temperature's away up, too. That isn't lingering radiation; that's prompt radiation." "Radioactivity hasn't dropped since morning; I'd think so, too," Melroy said. "What are they getting on the breakdown counter?" "Mostly neutrons and alpha-particles.
Cole looked across at him in sudden white-faced amazement. "They're gone " gasped Cole. Kendall stood paralyzed for thirty seconds. Then suddenly he seemed to come to life. "Neutrons! Neutrons and water tanks! Old Nichols was right " He turned to his friend. "Cole the tender quick." He darted a glance at the screen. The giant ship still lay alongside.
"'Water stops neutrons, I said. "The rocket-water tanks all around us! Great masses of water " gasped Cole. "That saved us?" "Right. I wonder if they've spotted us." The stranger ship was moving slowly in relation to the T-247. Suddenly the motion changed, the stranger spun and a giant lock appeared in her side, opened. The T-247 began to move, floated more and more rapidly straight for the lock.
The control officer called, "I have it centered, sir. We’ll reach it in about an hour at this speed." "Jack it up," O’Brine ordered. "Heave some neutrons into it. Double speed, then decelerate to reach it in thirty minutes." The control officer issued orders to the engine control room. In a moment acceleration plucked at them. O’Brine motioned to Rip. "Come on, Foster.
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