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- Q2077677 subject Q7195220.
- Q2077677 subject Q8220434.
- Q2077677 subject Q8556554.
- Q2077677 abstract "Uranium-232 (23292U140, 232U, U-232) is an isotope of uranium. It has a half-life of 68.9 years and is a side product in the thorium cycle. It has been cited as an obstacle to nuclear proliferation using 233U as the fissile material, because the intense gamma radiation of 232U's decay products makes the 233U contaminated with it more difficult to handle.Production of 233U (through the neutron irradiation of 232Th) invariably produces small amounts of 232U as an impurity, because of parasitic (n,2n) reactions on uranium-233 itself, or on protactinium-233, or on thorium-232:232Th (n,γ) 233Th (β−) 233Pa (β−) 233U (n,2n) 232U232Th (n,γ) 233Th (β−) 233Pa (n,2n) 232Pa (β−) 232U232Th (n,2n) 231Th (β−) 231Pa (n,γ) 232Pa (β−) 232UAnother channel involves neutron capture reaction on small amounts of thorium-230, which is a tiny fraction of natural thorium present due to the decay of uranium-238:230Th (n,γ) 231Th (β−) 231Pa (n,γ) 232Pa (β−) 232UThe decay chain of 232U quickly yields strong gamma radiation emitters:232U (α, 68.9 years)228Th (α, 1.9 year)224Ra (α, 3.6 day, 0.24 MeV) (at this point, the decay chain is identical to that of 232Th)220Rn (α, 55 s, 0.54 MeV)216Po (α, 0.15 s)212Pb (β−, 10.64 h)212Bi (α, 61 m, 0.78 MeV)208Tl (β−, 3 m, 2.6 MeV) (35.94% branching ratio)208Pb (stable)This makes manual handling in a glove box with only light shielding (as commonly done with plutonium) too hazardous, (except possibly in a short period immediately following chemical separation of the uranium from thorium-228, radium-224, radon-220, and polonium) and instead requiring remote manipulation for fuel fabrication.Unusually for an isotope with even mass number, 232U has a significant neutron absorption cross section for fission (thermal neutrons 7001750000000000000♠75 barns (b), resonance integral 7002380000000000000♠380 b) as well as for neutron capture (thermal 7001730000000000000♠73 b, resonance integral 7002280000000000000♠280 b).Template:Isotope".
- Q2077677 wikiPageWikiLink Q101395.
- Q2077677 wikiPageWikiLink Q1064418.
- Q2077677 wikiPageWikiLink Q11429.
- Q2077677 wikiPageWikiLink Q1148503.
- Q2077677 wikiPageWikiLink Q11523.
- Q2077677 wikiPageWikiLink Q1357356.
- Q2077677 wikiPageWikiLink Q1364891.
- Q2077677 wikiPageWikiLink Q1369686.
- Q2077677 wikiPageWikiLink Q179856.
- Q2077677 wikiPageWikiLink Q1895097.
- Q2077677 wikiPageWikiLink Q191637.
- Q2077677 wikiPageWikiLink Q191645.
- Q2077677 wikiPageWikiLink Q1969703.
- Q2077677 wikiPageWikiLink Q209351.
- Q2077677 wikiPageWikiLink Q2348563.
- Q2077677 wikiPageWikiLink Q2393673.
- Q2077677 wikiPageWikiLink Q2498986.
- Q2077677 wikiPageWikiLink Q2668919.
- Q2077677 wikiPageWikiLink Q302806.
- Q2077677 wikiPageWikiLink Q306786.
- Q2077677 wikiPageWikiLink Q483674.
- Q2077677 wikiPageWikiLink Q7195220.
- Q2077677 wikiPageWikiLink Q751259.
- Q2077677 wikiPageWikiLink Q8220434.
- Q2077677 wikiPageWikiLink Q8556554.
- Q2077677 comment "Uranium-232 (23292U140, 232U, U-232) is an isotope of uranium. It has a half-life of 68.9 years and is a side product in the thorium cycle.".
- Q2077677 label "Uranium-232".