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核电一、核裂变基本原理中子与铀235撞击时,铀235虽能吸收中子成为铀236,但不稳定,原子核剧烈变形最终分裂为两个碎片,这种现象即为核裂变。能引起核裂变的物质有铀233、铀235及钚239,其中天然存在的只有铀235,但天然铀中只有0.7%引起核裂变,其余99%以上是不引起裂变的铀238。核裂变放出大量能量的同时还飞出2～3个中子,这几个中子又撞击其它铀235引起裂变,而继续核分裂,依此类推,这种裂变叫链式反应(见图)。链式反应继续进行使裂变产生的能量达到一定限度叫做临界状态。
Nuclear Fission Fundamentals of Nuclear Fission When neutrons and uranium 235 strike, uranium 235 can absorb neutrons to become uranium 236, but is unstable. The intense deformation of the nuclei eventually splits into two fragments, a phenomenon known as nuclear fission. Uranium 233, uranium 235, and plutonium 239, which can only cause nuclear fission, of which uranium 235 is naturally occurring, only 0.7% of natural uranium causes nuclear fission and the remaining 99% are uranium that does not cause fission. Nuclear fission emits large amounts of energy at the same time it also fly out 2 or 3 neutrons, these neutrons hit another uranium 235 cause fission, and continue nuclear fission, and so on, this fission is called chain reaction (see photo). Chain reaction continues to fission generated energy reaches a certain limit called the critical state.