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Critical Mass: The core of a fission bomb contains a subcritical mass of fissile material, such as highly enriched uranium-235 or plutonium-239. To initiate a chain reaction, the core must reach a critical mass, where there is enough material to sustain a self-sustaining nuclear reaction.
Implosion: To achieve critical mass, a fission bomb typically uses an implosion mechanism. Explosives compress the fissile material into a smaller, denser state, increasing its density and triggering the chain reaction.
Neutron Initiator: A small amount of a radioactive isotope, such as beryllium-9 and polonium-210, is placed at the core's center. When the implosion occurs, this neutron initiator emits neutrons, initiating the nuclear chain reaction.