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Chapter 38: Problem 17
Three radon isotopes have \(125,134,\) and 136 neutrons. Write the symbol for each.
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In the dangerous situation of prompt criticality in a fission reactor, the generation time drops to \(100 \mu\) s as prompt neutrons sustain the chain reaction. If a reactor goes prompt critical with \(k=1.001\) how long does it take for a 100 -fold increase in reactor power?
A \(^{235} \mathrm{U}\) nucleus undergoes neutron-induced fission, yielding "I41 Cs, three neutrons, and another nucleus. What's that nucleus?
You're assessing the safety of an airport bomb-detection system in which neutron activation of the stable nitrogen isotope \(^{15} 7 \mathrm{N}\) turns it into unstable \(^{16}\) ?N. The N-16 decays by beta emission with 7.13-s half-life. How long after activation will the \(\mathbf{N}-16\) activity have dropped by a factor of 1 million?
The proton-proton cycle consumes four protons while producing 27 MeV of energy. (a) At what rate must the Sun consume protons to produce its power output of \(4 \times 10^{26} \mathrm{W?}\) (b) The present phase of the Sun's life will end when it has consumed about \(10 \%\) of its original protons. Estimate how long this phase will last, assuming the Sun's \(2 \times 10^{30}-\mathrm{kg}\) mass was initially \(71 \%\) hydrogen.
Explain and distinguish the roles of the control rods and moderator in a nuclear reactor.
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