Multiple choice

Which of the following isotopes of uranium is used for nuclear fission?

  1. 92U235

  2. 92U237

  3. 92U238

  4. 92U239
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A Correct answer
Explanation

Uranium-235 (92U235) is the primary isotope used for nuclear fission because it's fissile - it can sustain a chain reaction when struck by thermal neutrons. U-238 is the most abundant but not fissile, while U-237 and U-239 are not typically used for fission. Natural uranium contains only about 0.7% U-235, which is why enrichment is necessary for most reactor fuel and weapons.

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