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S10_Lec4N - CHM 11500 Lecture 4 Nuclear Chemistry Runaway...

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CHM 11500 Lecture 4, 06-18-10 Nuclear Chemistry
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Runaway Nuclear Reactions Three Mile Island, 1979
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Chernoble, 1986
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Runaway Nuclear Reactions Why didn’t these reactors explode like an atomic bomb? Nuclear fuel: 3% U-235 Weapon grade uranium: 97% U-235 Different design and geometries
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Yucca Mountain
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Yucca Mountain Waste container
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Yucca Mountain What’s intended to go in Yucca Mountain? The proposed Repository is planned to contain 77,000 tons of spent nuclear fuel from commercial nuclear reactors and high‑level radioactive waste from national defense activities. It could also contain the Three Mile Island reactor shell and rubble from the core. Why bury it? It’s going to be here for a long time.
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First order radioactive decay 6 h 6 h 6 h 6 h t ½ = 6 h
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Question X is radioactive. How much of a sample of X is left after 3 half-lives a. 1/2 b. 1/3 c. 1/4 d. 1/8 e. Impossible to tell without knowing the initial mass of X and its half life
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Pu-239 half-life is 24,000 years. How much plutonium-239 remains in a sample that initially contained 1.0 kg of plutonium after 96,000 years?
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