a) i) Strontium-90 ("Sr) is one of the products of thermal neutron fission of Uranium-235. It is unstable with a half-life of 28.8 years. A large quantity of 9°Sr was released in the Chernobyl disaster of 1986. By what year will that 90Sr have decayed to 1% of the initially-released quantity? ii) What is the function of a moderator material in a nuclear fission reactor? iii) Explain why light nuclei such as hydrogen isotopes are the preferred fuel for nuclear fusion
a) i) Strontium-90 ("Sr) is one of the products of thermal neutron fission of Uranium-235. It is unstable with a half-life of 28.8 years. A large quantity of 9°Sr was released in the Chernobyl disaster of 1986. By what year will that 90Sr have decayed to 1% of the initially-released quantity? ii) What is the function of a moderator material in a nuclear fission reactor? iii) Explain why light nuclei such as hydrogen isotopes are the preferred fuel for nuclear fusion
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Transcribed Image Text:a) i) Strontium-90 (ºSr) is one of the products of thermal neutron fission of
Uranium-235. It is unstable with a half-life of 28.8 years. A large quantity of
90Sr was released in the Chernobyl disaster of 1986. By what year will that
90Sr have decayed to 1% of the initially-released quantity?
2)
ii) What is the function of a moderator material in a nuclear fission reactor?
iii) Explain why light nuclei such as hydrogen isotopes are the preferred fuel for
nuclear fusion
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