15. In a sample of naturally occurring Uranium, such as from a mine, most of it is the isotope Uranium-238. What is the other isotope that is present and what percentage is it of the whole sample?
15. In a sample of naturally occurring Uranium, such as from a mine, most of it is the isotope Uranium-238. What is the other isotope that is present and what percentage is it of the whole sample?
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Transcribed Image Text:15. In a sample of naturally occurring Uranium, such as from a mine, most of it is the isotope
Uranium-238. What is the other isotope that is present and what percentage is it of the whole
sample?
16. What level of enrichment of Uranium with this fissile isotope is required for the operation of
a nuclear reactor?
a) 30-40% b) 0.7% c) 10% d) 3-5%
17. A moderator in a nuclear reactor serves the purpose of
a) slowing down neutrons so they can be captured by the uranium-235 nuclei
b) absorbing neutrons in order to stop the fission reaction
c) preventing the reactor core from cooling
d) none of these
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