EEE460-Homework3-S12

EEE460-Homework3-S12 - earth was formed about 4.5 billion...

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EEE 460 Nuclear Power Engineering Spring 2012 EEE460-Homework K. E. Holbert Homework Assignment #3 Due: Thursday, January 26 Chapter 5 Problems: 2 , 3, 5, 6, 9, 10 , 11, 12 , 16, 17 , 21 Points [67]: (8), (4), (5), (6), (4), (6), (6), (10), (6), (6), (6) Note : on Problem 5.21, you must compute the recoverable energy, that is, you cannot simply write down the value from Table 12.2. 1. On November 2, 1964, a Co-60 source had an activity of 4,100 Curies. Compute the activity of the source on February 2, 2012 in both Ci and Bq. [4 points] 2. Determine the specific activity [in Bq/g] of C-14. [4 points] 3. Since the half-life of U-235 (7.13×10 8 years) is less than that of U-238 (4.51×10 9 years), the isotopic abundance of U-235 has been steadily decreasing since the
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Unformatted text preview: earth was formed about 4.5 billion years ago. Currently, the natural uranium isotopic abundances are U-234, 0.0057 a/o (atom percent); U-235, 0.72 a/o; and U-238, 99.27 a/o. Neglecting the U-234 component, how many years ago was the isotopic abundance of U-235 equal to 3.0 a/o, which is the enrichment used in many nuclear power plants? [8 points] 4. Use Laplace transforms to find a time domain expression for n 3 ( t ) for general compound decay of n 1 → n 2 → n 3 where n 3 is a stable nuclide. Perform this derivation for the case of n 2 (0) ≠ 0, n 3 (0) ≠ 0 and λ 1 ≠ λ 2 . [10 points] Selected Answers: 5.2 E K (94.5% α ) = 5.687 MeV; E K (5.5% α ) = ? 5.10 (a) n = 9.32×10 10 atoms 5.12 (c) m Y-90 = 1.556 μg 5.17 m C-14 = 6.23 kg/yr...
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