![]() ![]() Some of them produce neutrons, called delayed neutrons, which contribute to the fission chain reaction. A critical chain reaction can be achieved at low concentrations of U-235 if the neutrons from fission are moderated to lower their speed, since the probability for fission with slow neutrons is greater.Ī fission chain reaction produces intermediate mass fragments which are highly radioactive and produce further energy by their radioactive decay. The fission process often produces gamma photons. The average of the fragment atomic mass is about 118, but very few fragments near that average are found. ![]() Typically, when uranium 235 nucleus undergoes fission, the nucleus splits into two smaller nuclei (triple fission can also rarely occur), along with a few neutrons (the average is 2.43 neutrons per fission by thermal neutron) and release of energy in the form of heat and gamma rays. If the reaction will sustain itself, it is said to be "critical", and the mass of U-235 required to produced the critical condition is said to be a " critical mass". Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei. About 85 of all absorption reactions result in fission. If an least one neutron from U-235 fission strikes another nucleus and causes it to fission, then the chain reaction will continue. If at least one neutron from each fission strikes another U-235 nucleus and initiates fission, then the chain reaction is sustained. If you take some uranium-235 and shoot a neutron at it, the uranium absorbs the neutron and becomes uranium-236. Uranium-235 Fission Example Initiation of this processĮnergy From Uranium Fission Form of Energy ReleasedĮnergy of decay products of fission fragments It turns out that nuclear fission isn't actually too difficult. About 85 of all absorption reactions result in fission. Uranium-235 Chain Reaction Uranium-235 Fission Detailed example ![]()
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