Uranium-235 - Wikipedia, the free encyclopedia
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Uranium-235 is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238 it is fissile, i.e. it can sustain fission chain reaction. It is the only fis...
en.wikipedia.org/wiki/Uranium-235
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Chemistry question: What is the critical mass for U-235? About 50kg ... Critical mass of uranium? Whats meant by critical mass? The critical mass for U-235 is? Whats the critical mass for U-235? What is the critical mass for U245? Which has the smaller critical mass? Why critical mass of uranium is 16.6 kg?
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wiki.answers.com/Q/What_is_the_critical_mass_for_U-235
wiki.answers.com/Q/What_is_the_critical_mass_for_U-235
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Physics question: How do you calculate critical mass of uranium 235? Each isotope has a different critical mass. U235 is used because the mass needed to cause a reaction is smaller than almost all other ... Each isotope has a different critical mass. U235 is used because the mass needed to cause a reaction is smaller...
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wiki.answers.com/Q/How_do_you_calculate_critical_mass_o...
wiki.answers.com/Q/How_do_you_calculate_critical_mass_of_uranium_235
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Brief and Straightforward Guide: What is Critical Mass? ... The concept of critical mass is important, because in order for this reaction to continue and release huge amounts of energy, there has to be enough fissile material present that it can continue.
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www.wisegeek.com/what-is-critical-mass.htm
www.wisegeek.com/what-is-critical-mass.htm
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The minimum mass of fissile material that can sustain a nuclear chain reaction is called a critical mass and depends on the density, shape, and type of fissile material, as well as the effectiveness of any surrounding material (called a reflector or tamper) at reflecting neutrons back into the fissioning mass.
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www.fas.org/nuke/intro/nuke/design.htm
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4. HEU – critical mass. Figure 2 shows the critical mass for a mixture of; U-235 and U-238 as a function of the U-235 enrichment, assuming a bare, metallic sphere. The critical mass for 100 % enriched uranium is 47.5 kg, while it is approximately 750 kg at 20 % enrichment.
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www.nti.org/e_research/official_docs/norway/HEU_as_Weap...
www.nti.org/e_research/official_docs/norway/HEU_as_Weapons_Material.pdf
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(M, total mass of uranium; r, radius of sphere; ro, critical radius; τ, time required for neutron density to multiply by a factor e). For a sphere of radius 4.2 cm (ro = 2.1 cm), M = 4700 grams, τ = 4 x 10-9 sec, we find E = 4 x 1020 ergs, which is about one-tenth of the total fission energy.
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www.atomicarchive.com/Docs/Begin/FrischPeierls.shtml
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1 U-234/U235 17; ... As the story of Critical Mass unfolds, it questions the foundations of the traditional history of the making and use of the first atomic bombs as well as our understanding of the Nuclear Age. The facts reveal not only important new information about the race to produce the bomb;
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saba.fateback.com/criticalmass/begin.html
saba.fateback.com/criticalmass/begin.html
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Chapter One - U-234/U235 ... The new-found evidence taken en mass demonstrates that, despite the traditional history, the uranium captured from U-234 was enriched uranium that was commandeered into the Manhattan Project more than a month before the final uranium slugs were assembled for the uranium bomb.
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saba.fateback.com/criticalmass/chap01.html
saba.fateback.com/criticalmass/chap01.html
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