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  • U-235 18.4Kg (a sphere 12.6cm diameter) will do, probably less.
  • P-239 6.4Kg (a sphere 9.2cm diameter) will do, probably less.

Nucleonics Fundamentals, McGraw Hill 1959, page 313

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13y ago
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5mo ago

Approximately 15 kilograms of highly enriched uranium-235 (U-235) is needed for a simple nuclear bomb, such as the one dropped on Hiroshima in 1945.

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Q: How much U235 is needed for a nuclear bomb?
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