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HW9-14b-14c-14d-15

HW9-14b-14c-14d-15 - 6-11(b The fission reaction taken to...

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6-11 (b) The fission reaction taken to its stable endpoint fission products is An + 2~~U ---+ ~gZr + l~~Ce + 4(An). The photons produced in the fission event and in the decay of the fission products are not shown. (c) The prompt energyrelease is the Q-value of the initial fission reaction, i.e., Ej = Q = [M(2~~U)+1nn-M(~gKr)-Mr~~Ba)-4mn]C2 = 169.5 MeV. (d) The energy released over the time required for the fission fragments to decay to their stable endpoints is Ejnd = Q = [M(2~~U)+mn-M(~gZr)-Mr~~Ce)-4mn]c2 = 190.0 MeV. 15. A 10 g sample of 235U is placed in a nuclear reactor where it generates 100 W of thermal fission energy. (a) What is the fissionrate (fission/s) in the sample? (b) After one year in the core, estimate the number of atoms of ~~Tc in the sample produced through the decay chain shown in Eq. (6.37). Notice that all fission products above ~~Tc in the decay chain have half-lives much shorter than 1 year; hence all of these fissionproducts can be assumed to decay to ~~Tc immediately.
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