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Updated: June 28, 2025
I refer to radioactive change, or to the atomic transformation of one element into another, such as the change of radium into helium, and the change of helium into lead a subject that takes us to the borderland between physics and chemistry where is still debatable ground. I began by saying that there were three kinds of changes in matter the physical, the chemical, and the vital.
The cost of mining them, and of lifting the heavy ore from Mars' gravitational field and carrying it to Earth was prohibitive. Only the finest carbon steel, and the radioactive metals, smelted and purified on Mars and transported to Earth, could be made profitable. But from the Asteroid Belt, it was a different story. There was no gravity to fight on the tiny asteroids.
"I ought to be busted to recruit," he told them. "I knew this asteroid was thorium, and that thorium is radioactive. If I had used my head, I would have added nuclite shielding to the list of supplies the Scorpius provided. We could have had enough of it to protect us while around our base, even if we couldn’t be protected while working on the charges.
A radioactive body is composed of atoms which have little stability, and are able to detach themselves spontaneously from the parent substance, and at the same time to divide themselves into two essential component parts, the negative electron and its residue the positive ion. The first-named constitutes the beta, and the second the alpha rays.
As a last thought I had, however, cleaned the mattress of the bed and the cracks and crevices in the brass bars. Teats of that dust showed it to be extremely radioactive. I had the dust dissolved, by a chemist who understands that sort of thing, recrystallized, and the radium salts were extracted from the refuse.
Wonderingly, I took the bottle; dipped it down into the Pool. The liquid was extraordinarily light; seemed, in fact, to give the vial buoyancy. I held it to the light. It was striated, streaked, as though little living, pulsing veins ran through it. And its blueness, even in the vial, held an intensity of luminousness. "Radioactive," said Marakinoff.
Thus, says Sir W. Crookes, each drop of rain falling on the surface of still water is not perceived as a drop of rain, but by reason of the slight splash which it causes at the moment of impact, and which is manifested by ridges and waves spreading themselves in circles. The various radioactive substances do not all give radiations of identical constitution.
"Greenhorn, aincha? Okay, I'll take you with me. We go out in the tubes and pull the lining. I pry up the stuff, you carry it back here and stack it." They sealed off the tube-room, pumped out the air, and went into the steaming, mildly radioactive tubes, just big enough for a man on hands and knees. Beyond the tube mouth was empty space, waiting for the man who slipped.
He was to identify Braun first, because if Braun had carried a half-pound of radioactive cobalt on him in Sid's Steak Joint the night before, Joe was going to die. And so were Haney and the Chief and Mike, and anybody else who'd passed near him. So Joe was to do the identification before he was disturbed by the information that he was dead. He made the identification.
Even in ordinary conditions, certain substances called radioactive emit, quite outside any particular reaction, radiations complex indeed, but which pass through fairly thin layers of minerals, impress photographic plates, excite fluorescence, and ionize gases. In these radiations we again find electrons which thus escape spontaneously from radioactive bodies.
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