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But no one had taught him how to make two bombs out of one. The theory behind this particular bomb design was simple. 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.
"Listen," Peterson said hurriedly, "our people think they've stumbled on something. Now we still don't know what's in those eggs or in Sally's milk that make them react as they do. All we've been able to find is some strange isotope but we don't know how to reproduce it or synthesize it. "But we do think we know what made Sally give that milk and made those hens start laying the gold eggs."
In the Sixteenth Century, that's what almost anyone would have meant. If you chose to interpret it as meaning "energy per unit time," why, that's real tough. Why nail the "power metal" down to an isotope of gold with an atomic weight of 197? Because that's the only naturally occurring isotope of gold.
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.
Martian lead or the terrestrial isotope?" asked Evans, tasting warily a peculiar dish before him. "Say, this is energy food. I thought we didn't get any more till Saturday." The change from the energy-less, flavored pastes that made up the principal bulk of a space-pilot's diet, to prevent over-eating, when no energy was used in walking in the weightless ship, was indeed a welcome change.
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