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Down on the surface Tiger had already inoculated a dozen of the healthy ones with various radioactive isotopes to help outline the normal metabolism and biochemistry of the people. After a short sleep period on the Lancet, he went back down alone to follow up on these, leaving Dal and Jack to carry on the survey work in the ship's lab. It was a gargantuan task that faced them.

Mykhyl Eschkhaffar ordered a programme of rationing and priorities to conserve the stock of plutonium and radioactive isotopes on hand, and he decided that henceforth nuclear-energy materials would be sold instead of furnished freely. He simply found out what the market quotations on Odin were, translated that into stellies, and adopted it.

The Beowulf ship she was named Viking's Gift came in on Tanith five and a half years after the Nemesis and the Space Scourge had raided Beowulf; her skipper had fought a normal-drive ship in that battle. Beside plutonium and radioactive isotopes, she carried a general cargo of the sort of luxury-goods unique to Beowulf which could always find a market in interstellar trade.

This latter method had proved highly satisfactory back on Earth, where it was separating out fissionable materials in large quantities and high purities from closely similar isotopes; and would now be tested for efficiency versus weight in some of the new problems being encountered in space.

But some isotopes of uranium and thorium have little beta, with some alpha and gamma, so Baxter concluded we had powdered uranium ore. There are many kinds of ore. Pitchblende is the best, but carnotite, which is a gray rock with yellowish streaks, is also good ore. Got it now?" Jan Miller asked, "How do you know all this, Rick?" The boy chuckled.

Bit by bit they divided the labor, checking in with Tiger by radio on the results of the isotopes studies he was running on the planet's surface. Bit by bit the data was collected, and Earthman and Garvian worked more closely than ever before as the task that faced them appeared more and more formidable. But the results of their tests made no sense whatever.

He hadn't tried yet for any of the radioactives except radium. He'd taken a full ounce of that in five raids, but hadn't attempted to get his hands on uranium, thorium, plutonium, or any of the other elements normally associated with atomic energy. Nor had he tried to steal any of the fusion materials; the heavy isotopes of hydrogen or any of the lithium isotopes.