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Pluto's namesake was Roman mythology's ruler of the underworld -- seemingly an apt inspiration for a locomotive-size missile that would travel at near-treetop level at three times the speed of sound, tossing out hydrogen bombs as it roared overhead. Pluto's designers calculated that its shock wave alone might kill people on the ground. Then there was the problem of fallout. In addition to gamma and neutron radiation from the unshielded reactor, Pluto's nuclear ramjet would spew fission fragments out in its exhaust as it flew by.
Tory-IIC was run again the following week for five minutes at full power, producing 513 megawatts and the equivalent of over 35,000 pounds of thrust; less radiation escaped in the reactor stream than had been expected. The test was witnessed -- at a safe distance -- by dozens of admiring AEC officials and Air Force generals.