Simplified schematic of a nuclear fission implosion weapon

Numbered parts:
  1. bomb casing
  2. detonators
  3. conventional high explosion
  4. pusher (aluminum, others) and reflector (beryllium, tungsten)
  5. tamper (uranium-238)
  6. fissile core (plutonium or uranium-235)

Sequence of events in explosion:

© 2001 by Wm. Robert Johnston.
Last modified 30 June 2001.
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