![]() To put the reactor into operation, the control blades are raised very slowly. When the control blades are fully inserted, they absorb so many neutrons from the uranium that there are not enough to allow a chain reaction to continue. Boron has the property of absorbing neutrons without re-emitting any. The rate of fissions in the uranium nuclei in the MIT reactor is controlled chiefly by six control blades of boron-stainless steel which are inserted vertically alongside the fuel elements. When it is in operation, the central active core contains a huge number of neutrons traveling in every direction at very high speeds. The MIT Research Reactor is used primarily for the production of neutrons. Hence, the possibility exists for creating a chain reaction. Each time a U-235 nucleus splits, it releases two or three neutrons. This process is known as fission (see diagram below). When a U-235 nucleus absorbs an extra neutron, it quickly breaks into two parts. The arrangement of particles within uranium-235 is somewhat unstable and the nucleus can disintegrate if it is excited by an outside source. What is a real-life example of fission?Īns:A good example of a fission reaction is the nuclear power plant.In the nucleus of each atom of uranium-235 (U-235) are 92 protons and 143 neutrons, for a total of 235. Extremely high energy is required to bring two or more protons close enough that nuclear forces overcome their electrostatic repulsion. What are the need and conditions required for nuclear fusion?Īns:Very high-temperature and high-pressure environment is required. Both uses are possible because certain substances called nuclear fuels undergo fission when struck by fission neutrons, and in turn emit neutrons when they break apart. PRACTICE QUESTIONS RELATED TO NUCLEAR FISSION
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