Assertion: hydrogen bomb's yield | /r/HasProperty | the 500 kiloton
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text: The largest actual yield of a pure fission bomb was the 500 kiloton Ivy King test of 1952, using a hollow spherical uranium-235 core implosion assembly design with a boron-aluminum alloy chain filling the hollow core to prevent the large amount of uranium from undergoing an accidental predetonation/"fizzle" due to stray neutrons or spontaneous fission neutrons (the chain was rapidly removed by a motor shortly before detonation of the explosive lenses).