lec5.ppt

lec5.ppt - CHM 11500-M01 and M02 Dr Towns Lecture 5 Reading...

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1 CHM 11500-M01 and M02 Dr. Towns Lecture 5, 9-12-08 Reading was: 23.3 - 23.5
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2 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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3 Yucca Mountain Waste container
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4 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?
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5 Think/Pair/Share Question #1
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6 Question #2
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7 First order radioactive decay 6 h 6 h 6 h 6 h t ½ = 6 h
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8 The Nuclear Half-life Half-lives vary dramatically. 3 1 H t 1/2 = 12.26 y 14 6 C t 1/2 = 5730 y 60 27 Co t 1/2 = 5.3 y 239 94 Pu t 1/2 = 2.4 x 10 4 y 263 106 Sg t 1/2 = 0.8 s
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9 Nuclear Kinetics Radioactive decay is first order (t½ independent of concentration). N = counts dN/dt = activity = counts per s (or min, hr, . ..) dN/dt = slope of N vs t Decay of Tc-99m Counts per second vs time
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10 Nuclear Kinetics dN/dt = counts per s (or min, hr, . ..) = slope of N vs t Rate equation dN/dt = -kN d[A]/dt = -k[A] Integrated rate equation ln{N o /N} = kt ln{[A o ]/[A]} = kt
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This note was uploaded on 10/26/2009 for the course CHM 111 taught by Professor Staff during the Spring '08 term at Purdue.

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lec5.ppt - CHM 11500-M01 and M02 Dr Towns Lecture 5 Reading...

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