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Curious as to the reason why Pax had isolated himself in this frozen wilderness, they next examined the high cliffs which shut in the valley on the west and against the almost perpendicular walls of which he had played the Lavender Ray. These cliffs proved, as Bennie had already suspected, to be a gigantic outcrop of pitchblende or black oxide of uranium.
We can operate very nicely at five thousand light-centuries. So there you are it'll probably be somewhere between thirty-nine and forty-one days, but it may be a day or so more or less." "How do you know they are using copper?" asked Margaret. "Maybe their scientists stored up some uranium and know how to use it." "Nope, that's out like a light.
Nope, I'm developing a cautious streak myself now, when I take time to do it. We've got lots of uranium, and I'm going to put one course out." "You cannot put everything out, can you?" "Not quite, but pretty nearly, I'll leave a hole in the ether screen to pass visible light no, I won't either.
The metal uranium has been classed with the elements since it was isolated in 1840. In 1896, Becquerel found that compounds of uranium, and also the metal itself, are radio-active.
Two or more correctly sized pieces of plutonium or uranium isotope, when brought together, formed what was known as a critical mass, which would fission. The fissioning released energy and produced the explosion. But there was a wide gap between theory and practice. A nuclear bomb was actually pretty complicated.
Sid's signal reactions were setting away from him again; uranium meant nuclear power to him, and the two words were interchangeable. As she studied the arrangement of the numbers and words, she could hear Tranter saying: "Nuts, Sid. We knew about uranium a long time before anybody found out what could be done with it. Uranium was discovered on Terra in 1789, by Klaproth."
First, Mart and I saw only copper bars in their ship. Second, copper is the most efficient metal found in quantity upon their planet. Third, even if they had uranium or any metal of its class, they couldn't use it without a complete knowledge of, and ability to handle, the fourth and fifth orders of rays."
Salts of radium have in general the same chemical properties as the corresponding salts of barium, but are distinguished from them by the differences of solubility which allow of their separation, and by their enormous activity, which is about a hundred thousand times greater than that of uranium. Radium produces various chemical and some very intense physiological reactions.
"I have discovered," he said, "that Venus is exceedingly rich in the precious metals, as well as in iron and lead. They mine them all, and we shall visit the mines under Ala's escort. My real purpose, of course, is to find uranium, of whose properties, strangely and for us luckily enough, they seem to have no knowledge.
Had we thought and worried over the matter before the time had arrived, you will note that it would have been pain wasted, for our young friend Seaton has avoided that difficulty in a truly scholarly fashion." "All set, then, Rovol?" asked Seaton, when the forces flying from the projector had built the compound exciter which would make possible the disruption of the atoms of uranium.
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