Fission Weapons 2
Fission Weapons 2 : An ordinary atomic bomb of the kind used in World War II uses the process of nuclear fission to release the binding energy in certain nuclei. The principal materials used for fission weapons are U-235 and Pu-239. These materials are termed "fissile" because they can be split into two roughly equal-mass fragments when struck by a neutron of even low energies. When a large enough mass of either material is assembled, a self-sustaining chain reaction results after the first fission is produced
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