Fission bombs are characterized by a type of bomb where the nuclear force comes from a [[fission reaction]]. At its simplest, two sub-critical amounts of a fissile material are joined to form a [[critical mass]] which undergoes a spontaneous chain reaction. Bombs such as these usually use isotopes of [[uranium]] (uranium-235, uranium-233) or [[plutonium]]-239 as the fissile material. | Fission bombs are characterized by a type of bomb where the nuclear force comes from a [[fission reaction]]. At its simplest, two sub-critical amounts of a fissile material are joined to form a [[critical mass]] which undergoes a spontaneous chain reaction. Bombs such as these usually use isotopes of [[uranium]] (uranium-235, uranium-233) or [[plutonium]]-239 as the fissile material. |