Nuclear fission
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Nuclear fission



I have shared fully about nuclear fission with examples.Perfect ppt for a seminar.use it to get benefited!Explore nuclearphysics!

I have shared fully about nuclear fission with examples.Perfect ppt for a seminar.use it to get benefited!Explore nuclearphysics!



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    Nuclear fission Nuclear fission Presentation Transcript

    • Welcome
    • Done by, PL.Sriram
    • Nuclear reaction Nuclear Fission Nuclear fusion Chain reactionControlled reaction Uncontrolled rection
    • Reaction
    • Physical reactionInvolves a change in the nucleus of an atomTwo types –Fission and fusion.Source – Mass of the nucleusReleased mainly in the form of heat energyKnown as atomic energy
    • 17Cl35 + 0n1 15P32 + 2He4 + High energy When Uranium 235 atoms are bombarded with slow moving neutrons,the heavy uranium nucleus breaks up to produce two medium-weight atoms ,neutrons and a tremendous amount of energy. 235 + 0n1 139 + 94 + 30n1 + High energy U92 56Ba 36Kr
    • E =Mc 2
    •  Fission means ‘to split’ German scientist otto hann and strassmandiscovered that when a 92U235 nucleus is bombardedby thermal neutrons,it splits up into two smalllernuclei of barium and Krypton along with the releaseof three neutrons The process in which the heavy nucleus of a radioactiveatom (such as uranium,thorium and plutonium) splits upinto smaller nuclei when bombarded with low energyneutrons is known as nuclear fission.
    • The sum of masses of the smaller nuclei formed in afission reaction is a little less than that of the mass of theoriginal heavy nucleusSo,there is a small loss of mass in the nuclear fissionprocess. This energy is used for generating electricity.
    • Neutrons may: 1 - Cause another fission by colliding with a U235 nucleus • Creates two smaller nuclides and free neutrons • The free neutrons potentially collide with nearby U235 nuclei • May cause the nuclide to split as wellEach split (fission) isaccompanied by alarge quantity of E-N-E-R-G-Y
    • Chain reaction When the neutrons in the fission reaction continuouslybombard with heavy nuclei then , a continuous selfsustaining nuclear chain reaction happens. Sometimes,I t becomes uncontrolllable and that isthe atom bomb. To control it boron rods are used because boron hasthe property to absorb neutrons.
    • Chain reaction
    • U.S. Electrical PowerProduction by Source
    • Review Nuclear fission: A large nucleus splits into several small nuclei when impacted by a neutron, and energy is released in this processNuclear fusion:Several small nuclei fusetogether and releaseenergy.
    • AdvantagesProduces tremendous energy from a small amountof nuclear fuel.Once the nuclear fuel is filled,the plant can go foryears together.Does not produce greenhouse gases like CO2
    • DisadvantagesDifficult to dispose the radioactive waste from thenuclear fission reaction.Risk of accidents in Nuclear reactorsHigh cost of installation of nuclear power plantsand limited availability of uranium.
    • Thank you