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B Reactor’s Slide Rule: Touched By Fermi?

August 30, 2009

Scientist Enrico Fermi was a superstar of nuclear physics. He was the genius who helped to build the first atomic pile in 1939, and who later oversaw the construction of the B Reactor outside of Richland, Washington.

On a recent tour of the reactor, we were shown Fermi’s office, which displays a 1944-model slide rule. Michele Gerber, the reactor’s historian, told us that “Fermi would have used a slide rule exactly like this” to calculate the stacking of the reactor’s graphite core, or the maximum amount of uranium that could be shoved into it without exploding. She cautioned that “it’s not his, but one like it,” but maybe she just has to say that.

A slide rule touched by Fermi — an extension of his brain — would be a powerful totem in the wrong hands. But whether or not this particular slide rule fits that description, its safety seems secure. Thieves would have a hard time escaping the reactor’s paramilitary patrols, or crossing the miles of desert that surround it without falling into a radioactive sludge pit or being killed by a rattlesnake.

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