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Distinguish between a controlled and an ...

Distinguish between a controlled and an uncontrolled chain reaction.

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In a controlled chain reaction the neutron population is allowed to reach a steady state and thereafter the number of fission producing neutrons is maintained constant . This principle is used in the power reactor.
In an uncountrolled chain reaction the number of neutrons is allowed to multiply indefinitely in a very short interval. The entire mass undergoes fission and huge quantity of energy is released. This causes violent explosion.
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