Assertion: nuclear weapon's energy | /r/CreatedBy | fission
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text: In general, the energy released in the explosion of a high-yield thermonuclear weapon stems from the boosted-fission chain reaction in the primary stage and the fissioning and “burning” of thermonuclear fuel in the secondary (and any subsequent) stage, with roughly 50 to 75 percent of the total energy produced by fission and the remainder by fusion.