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Updated: June 19, 2025
Now, I want to talk to every one of your people who can tell me anything at all...." Seshat was the closest; they went there first. They were too late. Seshat had had it already, and on the evidence of the radioactivity counters, not too long ago. Four hundred hours at most.
"When Vidac and Hardy refused to let me go down and make an inspection of the satellite after the instruments conked out, I knew there was something fishy," Sykes continued. "Any fool could have seen that radioactivity would be the only thing to cause an instrument disturbance like that!" "Then Vidac and Hardy knew about the uranium?" asked Strong.
This fact of the variation in the properties of elements in accord with their atomic weights has been even more strikingly illustrated by the behavior of discharges of electricity through rarified gases, as well as by the facts of radioactivity.
It was amazingly sensitive to any form of radioactivity and the missile, of course, would be "hot" from exposure to cosmic rays. Meanwhile, Tom had ordered his new hydrolung suit, with its four-plunger control unit and porpoise sonar, to be flown back to Enterprises. Arv Hanson had promised to make up several duplicates with a team of technicians working on all-night shifts.
Before the Silent Death strikes you down." "I'm going to have a look at this." "You'll be killed!" Copper said. "And if you die, I die too." "Don't be foolish. There's nothing here that can hurt me. See those trees and plants growing right up to the crater's edge. If they can take it permanently, I can stand it for a few moments. If there's any radioactivity there, it's not very much."
Thus M. Curie particularly set himself to study the manner in which the radioactivity of the emanation is dissipated, and the radioactivity that this emanation can induce on all bodies. The radioactivity of the emanation diminishes in accordance with an exponential law.
We have only begun to know of X-rays and the alpha, beta, and gamma rays from them, of radium, radioactivity, and finally of this new force which I have discovered and call 'protodyne, the original force. "In short, we find in the universe Matter, Force, and Ether.
But the radioactivity would be so powerful we couldn't last more than a few days. We have no antiradiation gear. Not even food or water." He paused and scanned the sky. "No," he said in a surprisingly casual voice, "the only way we can get out of this is for Tom to come back and get us." Shinny and Alfie came over and joined the group around the jet boat. No one said anything.
The name for this element, radium, was proposed by Madame Curie, who had also suggested the term "radio-activity." The bearing of the discovery of radium and radioactivity upon theories of the atom and matter will be considered in a moment; first the more tangible qualities of this wonderful substance may be briefly referred to.
First, two or more pieces of plutonium large enough to form a critical mass. Second, a neutron source—some material with the type of radioactivity that produced neutrons—to start the reaction. Third, some kind of neutron reflector. And fourth, explosive to drive the pieces together. Did they have all those items? He checked them off.
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