![]() ![]() This unstable nuclide will then undergo fission. While all neutrons in an uncontrolled chain reaction are allowed to induced fission reactions, the number of neutrons allowed to do this in a controlled chain reaction is determined by the number of control rods used.Ĭontrol rods are commonly made of cadnium or boron.įor a neutron to induce fission, it must first be captured in the parent nuclide to form a temporary unstable nuclide. Since absorbed neutrons cannot induced further fission reactions, the use of control rods reduces the rate of fission and hence is essential to facilitate a controlled chain reaction.
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