While uranium-235 is the isotope that undergoes fission it is worth noting that uranium-238 atoms can absorb neutrons to become plutonium-239 which is another atom that can undergo fission. We will consider where the energy comes from in the next section. It is 50 million times more energy than burning the equivalent amount of carbon. The energy released per fission is relatively large.The neutrons may need to be slowed down and are then referred to as thermal neutrons. Both the number and speed of the neutrons is crucial within a working reactor. It also doesn’t produce highly radioactive fission products. ![]() This is the same process that powers the sun and creates huge amounts of energyseveral times greater than fission.
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