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NUCLEAR FISSION: In our previous session, we learned about the nuclear process. Now let's learn about the chain reaction in the nuclear process. A nuclear process in which a heavy nucleus, when bombarded with neutrons, splits into two nuclei of almost equal mass with the release of a huge amount of energy is called nuclear fission. In the above process, each neutron can cause fission, but with fission it also releases 3 more neutrons with each fission reaction. Each neutron released can cause another fission reaction. .Thus, the three neutrons released in turn release 9 neutrons. In the same way, the reaction continues and neutrons accumulate in a geometric progression and fission occurs until the total uranium is exhausted in chain. This process is called a chain reaction and these reactions are called self-sustaining fision series. Chain reaction: is a series of nuclear fissions in which the neutrons produced in each fission cause additional fissions. There are two stages of chain reactions. Uncontrolled chain reaction. Controlled chain reaction. Uncontrolled Chain Reaction: In chain reaction, there is no control over the number of fissions that take place and such reactions are called uncontrolled chain reactions. In this chain reaction, more than one of the neutrons produced in a particular fission causes other fissions. So the number of fissions increases very quickly. Therefore, a huge amount of energy is released in a few millionths of a second and is released in the form of a violent explosion. An average energy of about 200 MeV megaelectronvolts would be released by fission. So, an uncontrolled chain reaction can generate an incredible amount of energy in a very short time. This is actually what happens in an “atomic bomb”. :
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