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DateDocumentOrganization and type
How Nuclear Weapons Work
The document describes how nuclear weapons generate energy through fission (splitting heavy nuclei) and fusion (combining light nuclei). It details the transition from early 'gun-type' fission weapons to modern thermonuclear weapons that use a primary fission stage to trigger a secondary fusion stage. It also outlines the technical challenges of uranium enrichment and plutonium reprocessing, and provides estimated warhead counts for nuclear-armed states as of 2025.
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Document type: Guide
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