The concentration of 235U in nuclear fuel rods is too low to make a thermonuclear device (atomic bomb). True False
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Nuclear fuel rods typically contain a mixture of isotopes, primarily uranium-238 (238U) and a smaller percentage of uranium-235 (235U). The concentration of 235U in these rods is usually around 3-5%. Show more…
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QUESTION 23 Nuclear reactor fuel pellets contain uranium that is A. 100% 235U B. 3.5% 238U and 96.5% 235U C. 50% 238U and 50% 235U D. 100% 238U E. 3.5% 235U and 96.5% 238U QUESTION 24 Nuclear fuel rods used to produce electricity are more radioactive after they have been used for several years compared to their radioactivity prior to their use. True False
Rolly S.
Which of the following statements about the uranium used in nuclear reactors is or are true? (i) Natural uranium has too little ${ }^{235} \mathrm{U}$ to be used as a fuel. (ii) ${ }^{238} \mathrm{U}$ cannot be used as a fuel because it forms a supercritical mass too easily. (iii) To be used as fuel, uranium must be enriched so that it is more than $50 \%^{235} \mathrm{U}$ in composition. (iv) The neutron-induced fission of ${ }^{235} \mathrm{U}$ releases more neutrons per nucleus than fission of ${ }^{238} \mathrm{U}$
Which of the following statements about the uranium used in nuclear reactors is or are true? (i) Natural uranium has too little $^{235} U$ to be used as a fuel. (ii) $^{238} U$ cannot be used as a fuel because it forms a supercritical mass too easily. (iii) To be used as fuel, uranium must be enriched so that it is more than 50$\%^{235} \mathrm{U}$ in composition. (iv) The neutron-induced fission of $^{235} \mathrm{U}$ releases more neutrons per nucleus than fission of $^{238} \mathrm{U}$.
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