Questions and Answers about Final Exam 

Questions and Answers about Final Exam - Final May 5...

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Final May 5 3:30-5:30 Office hours/ Review Tuesday 3:00-5:00 Christian Stephan-Otto Wed. 2:00-5:00 Practice exam, extra problems & list of concepts are in Course Documents Some questions that students asked: Q. What should we know about isotopes - 235 and 238 Uranium - separation - thermal separation. A. U235 is the isotope that undergoes FAST fission. U238 can undergo slower fission, but absorbs neutrons also, so is not useful for the A-bomb. However, U238 is used in the H-bomb to increase the number of fissions, but it is not part of the “primary”. See the handout on the H-bomb. The separation or “enrichment” of Uranium increases the amount of U235 compared to U238. Naturally occurring Uranium (from mines) is only 0.7% U235, with the rest being almost totally U238. Separation was accomplished in the Manhattan Project by “gaseous diffusion” at Oak Ridge, Tenn. Thermal separation did not work adequately for the huge task. Nowadays centrifuges are used to separate the Uranium Hexafluoride gases into U235 vs. U238.
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