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Updated: June 16, 2025
He reached the first pyramid of thorium and directed, "Get behind these rocks and stay down. Feel your way. Use me for a guide. I'll hold on until you're under cover." He gripped a crystal. "Come on." Dominico pulled himself along Dowst's prone form and then along Rip's.
One team was coming almost directly toward them. The other team was slanting away from them and would soon be out of sight behind the thorium crystals in which the cave was located. Fortunately, the Connies were going away from the cave. A Connie from the near-by team swung his beam back and forth, and it cut space over their heads. Rip saw a few low pyramids of thorium a few rods away.
PORCO ... GALLINA: these words are used collectively, as rosa often is; so Fin. 2, 65 potantem in rosa Thorium. Varro, R.R. 2, 14 has the word in the sense of 'meat'. CONDITIORA FACIT: 'adds a zest to'; cf. condita in 10. SUPERVACANEIS OPERIS: 'by the use of spare time'; literally 'by means of toils that are left over', i.e. after completing the ordinary work of the farm.
In the same way, the mass of thorium was known. The measurements of the asteroid were being taken. They would be compared with a chunk of thorium of the same size. If it worked out, that would be evidence enough. Commander O’Brine motioned to chairs. "Might as well sit down while we’re waiting, Foster." He took one of the chairs and looked closely at Rip. Suddenly he grinned.
Rip exclaimed. "Call if you need help." Koa was already out of the craft and leading the way. Rip went out through a window and saw the cause of the trouble. Dowst had been a hair too close to the asteroid. A particularly high crystal of thorium had snagged the landing craft. Rip looked for the Connie and saw it make another turn. They had only a moment or two before the next run.
It is like the single voice crying aloud that betrays the silent breathing multitude in the darkness. Radium is an element that is breaking up and flying to pieces. But perhaps all elements are doing that at less perceptible rates. Uranium certainly is; thorium the stuff of this incandescent gas mantle certainly is; actinium. I feel that we are but beginning the list.
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.
Fortunately, the Connies were going away from the cave. A Connie from the nearby team swung his beam back and forth, and it cut space over their heads. Rip saw a few low pyramids of thorium a few rods away. Quickly he ordered, "Dowst, hang on to my boots. Dominico, hang on to Dowst's boots." He lay face down on the metal ground until he felt hands grip his boots, then he asked, "All set?"
"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.
The life-period of uranium is probably about eight thousand million years. The life-period of thorium is possibly about forty thousand million years.
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