U- 238 muaj ib qho loj, thiab khib nuclei ntau dua fissile Fissile Fissionable
A nuclide muaj peev xwm ua kom tsis muaj fission (txawm tias tsis tshua muaj tshwm sim) tom qab ntes cov neutron ntawm siab lossis qis zog yog hu ua "fissionable". Lub fissionable nuclide uas tuaj yeem cuam tshuam rau fission nrog qis-zog thermal neutrons nrog qhov ua tau zoo yog hu ua "fissile". https://en.wikipedia.org › wiki › Fissile_material
Cov khoom siv tsis sib haum - Wikipedia
vim qhov ntxiv neutron ntxiv lub zog - ntau dua li qhov yuav tsum tau ua rau fission qhov tshwm sim nucleus. vim ntau lub zog xav tau, U- 238 ib txwm yuav tsis raug fission hauv nuclear reactor.
Vim li cas U 238 ruaj khov dua U 235?
gg-nuclides zoo li 238U tsis tso lub zog txaus thaum ntes cov neutron. Yog li no neutrons yuav tsum nqa ntau lub zog kinetic kom zoo siab rau lub nucleus saum lub fission barrier. … U-238 muaj 4 ntau neutrons tshaj U-234 thiab peb ntau neutrons tshaj U-235. U-238 yog qhov ruaj khov yog li muaj ntau dua ib txwm muaj.
Puas yog U 235 lossis U 238 muaj xov tooj cua ntau dua?
Feem ntau, uranium-235 thiab uranium-234 ua rau muaj kev phom sij ntau dua kev noj qab haus huv dua li uranium-238 vim tias lawv muaj lub neej luv dua ib nrab, lwj sai dua, thiab yog li "ntau cov xov tooj cua." Vim tias tag nrho cov uranium isotopes feem ntau yog alpha emitters, lawv tsuas yog muaj kev phom sij yog tias noj lossis nqus tau.
Koj puas tuaj yeem tau txais kev sib cais?
Uranium-238 thiab thorium-232 (thiab qee cov khoom siv fissionable) tsis tuaj yeem tswj hwm qhov tawg tawg ntawm tus kheej, tab sis cov isotopes tuaj yeem ua rau fission los ntawm kev tswj xyuas sab nraud muab cov neutrons ceev ceev los ntawm fission lossis fusion cov tshuaj tiv thaiv.
U 238 puas tshwm sim?
Natural uranium yog tsim los ntawm peb lub isotopes loj, uranium-238 (99.2739–99.2752% natural abundance), uranium-235 (0.7198–0.7202%), thiab uranium- 234 (0.0050–0.0059%).
