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Trash can sized nuclear reactors! Quote: A theoretical exercise published in 2006 showed that the smallest possible thermal fission reactor would be a spherical aqueous homogenous one powered by a solution of Am-242m(NO3)3 in water. Its mass would be 4.95 kg, with 0.7 kg of Am-242m nuclear fuel, and diameter 19 cm. Power output would be a few kilowatts. Possible applications are space program and portable high-intensity neutron source. The small size would make it easily shielded. Sourced from: http://www.world-nuclear.org/info/nuclear-fuel-cycle/power-reactors/small-nuclear-power-reactors/ I doubt superheavy elements such as Americium will be a viable fuel source in the near future, but it's still an interesting topic to discuss. As that snippet mentioned, I think one of the best applications would be in space, where mass is at a premium (though I doubt the savings in mass would be enough to offset the massive materials costs).