Question

In atomic bomb what convert the fast neutron to thermal neutron?​

Answer 1

An atomic bomb uses fission, that is, the breaking of an atom's nucleus into smaller particles. This results in the release of neutrons and lots of energy that become an atomic explosion. In comparison, a hydrogen bomb is about fusion — fusing atomic nuclei together to combine into bigger ones.

A hydrogen bomb, or a thermonuclear bomb, contains a fission weapon within it but there is a two-stage reaction process.

It uses the energy from a primary nuclear fission to set off a subsequent fusion reaction. The energy released by fusion is three to four times greater than the energy released by fission, giving the "hydrogen" bomb, or H-bomb, more power. The name comes from the fact that it uses a fusion of tritium and deuterium, hydrogen isotopes.

Essentially, an H-bomb is only limited by the amount of hydrogen within it and can be made as powerful as its builder wishes it to be, making it a big threat should a perceived "rogue" state like North Korea develop one.

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Answer 2

neutron moderator: A medium that reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235.