What is mean by controlled nuclear fission
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Controlled Nuclear Fission. To maintain a sustained controlled nuclear reaction, for every 2 or 3 neutrons released, only one must be allowed to strike another uranium nucleus. ... Most reactors are controlled by means of control rods that are made of a strongly neutron-absorbent material such as boron or cadmium.
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when we do any nuclear reaction in our lab .. just to ensure no any harm we you many moderator and controller to stop unstopable reaction that is called controlled reaction
generally cadmium rod , graphite and heavy water (D2O) is used
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