45
In nuclear fission (Fig. 1.29), nuclei are divided into lighter nuclei, neutrons, and
energy. The minimum mass required to support a self-sustaining nuclear chain reaction (a series of nuclear fission reactions) is called the critical mass. In nuclear
fusion, two nuclei combine to generate a heavier nucleus as well as high energy
(Averill and Eldredge 2012).
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Fig. 1.29 Neutron-induced nuclear fission
Box 1.2 Radioactive Waste Case Study
Nuclear reactions are used to generate electricity in power plants by adopting
neutron-induced nuclear fission (Fig. 1.29), wherein neutrons are used to split
large atoms, thereby, releasing energy. Heavy-water reactors use unenriched
uranium as a fuel, whereas light-water reactors use enriched uranium as a fuel.
References
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