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Updated: June 28, 2025
And he learned that the thermit-throwers actually spat out in normal operation tiny droplets of matter Aten could not describe clearly, but which seemed to be radioactive with a period of five minutes or less; that in Rahn, the nearest other city, cuyal was taken openly, and the jungle was growing into the town with no one to hold it back; that two generations since there had been twenty cities like this one, but that a bare dozen still survived; that there was a tradition that human beings had come upon this planet from another world where other human beings had harried them, and that in that other world there were divers races of humanity, of different colors, whereas in the world of the Golden City all mankind was one race; that Tommy's declaration that he came from another group of dimensions had been debated and, on re-examination of Jacaro's Tube, accepted, and that there was keen argument going on as to the measures to be taken concerning it.
With this thought came the guilty realization that he had forgotten completely about Telt's death. Even before he contacted the Nyjord fleet he must tell Hys and his rebel army what had happened to Telt and his sand car. Also about the radioactive traces.
By studying the spectrum of the gas disengaged by a solution of salt of radium, Sir William Ramsay and Professor Soddy remarked that when the gas is radioactive there are first obtained rays of gases belonging to the argon family, then by degrees, as the activity disappears, the spectrum slowly changes, and finally presents the characteristic aspect of helium.
The researches on radioactive substances have their starting-point in the discovery of the rays of uranium made by M. Becquerel in 1896. As early as 1867 Niepce de St Victor proved that salts of uranium impressed photographic plates in the dark; but at that time the phenomenon could only pass for a singularity attributable to phosphorescence, and the valuable remarks of Niepce fell into oblivion.
In another three hours, with the asteroid now speeding on its new course, Rip set off the explosion that blasted straight back and gave extra speed. Three radioactive craters marked the asteroid. Rip checked the radiation level and didn't like it a bit. He decided to set up the landing boat and their supplies as far away from the craters as possible, which was on the sun side.
It has been shown pretty conclusively that all ordinary matter is already in its most stable state, so that work must be done upon any ordinary atom to decompose it. Besides, if he had either radioactive accumulators or intra-atomic energy, he would have cut us up long ago.
Geiger counters would have instantly shown any attempt to smuggle radioactive material into the Shed...." Joe glanced sidewise at Sally. "That's for a publicity release?" he asked. She nodded. "It's true, too. Nothing goes in or out of the Shed without passing close to a Geiger counter. Even radium-dial watches show up, though they don't set the sirens to screaming."
The radiations, or emanations, of the radio-active substances, on the other hand, are given out spontaneously, pass through substances opaque to ordinary light, such as metal plates, act upon photographic plates, and discharge electrified bodies. The substances uranium, thorium, polonium, radium, and their compounds are radioactive, radium being by far the most active.
Since January 1977, significant progress has been achieved in resolving three critical problems resulting from the use of nuclear energy: radioactive waste management, nuclear safety and weapons proliferation. In 1977, the Administration announced its nuclear nonproliferation policy and initiated the International Fuel Cycle Evaluation.
It happens to be a very important minor planet." Rip waited, intent on the commander's words. "It's important," O'Brine continued, "because it happens to be pure thorium." Rip gasped. Thorium! The rare, radioactive element just below uranium in the periodic table of the elements, the element used to power this very ship! "What a find!" he said in a hushed voice.
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