2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Lub ntiaj teb uranium tau xav tias yuav tsim nyob rau hauv ib lossis ntau lub supernovae tshaj 6 billion xyoo dhau los. Kev tshawb fawb tsis ntev los no qhia tias qee qhov uranium yog tsim nyob rau hauv kev sib koom ua ke ntawm cov hnub qub neutron. Uranium tom qab ntawd tau ua kom nplua nuj nyob rau hauv lub teb chaws crust. Radioactive decay contributes ib nrab ntawm lub ntiaj teb lub tshav kub flux.
uranium tuaj qhov twg?
Kev mining ntawm uranium
Uranium mines ua haujlwm hauv ntau lub tebchaws, tab sis ntau dua 85% ntawm uranium yog tsim nyob rau hauv rau lub teb chaws: Kazakhstan, Canada, Australia, Namibia, Niger, thiab Russia. Keeb kwm, cov mines ib txwm (xws li qhib qhov av lossis hauv av) yog qhov tseem ceeb ntawm uranium.
Puas yog txiv neej uranium tsim?
Uranium yog ib qho naturally tshwm simlub caij uas muaj nyob thoob plaws ntiaj teb. Cov isotopes ntawm uranium decay feem ntau los ntawm alpha-particle emission, tab sis kuj tseem muaj cov txheej txheem hu ua "spontaneous fission" uas qee zaus sib tw nrog alpha decay.
Uranium yog dab tsi?
Uranium yog ib qho tseem ceeb heev vim nws muab peb cov roj nuclear siv los tsim hluav taws xob hauv cov chaw nres tsheb nuclear. Nws tseem yog cov khoom tseem ceeb los ntawm lwm cov khoom siv hluavtaws transuranium ua. Ib txwm tshwm sim uranium muaj 99% uranium-238 thiab 1% uranium-235.
Uranium tshwm sim li cas?
Nws tshwm sim ib txwm muaj nyob rau hauv qis qis ntawm ob peb qhov hauv ib lab hauv av, pob zeb thiabdej, thiab yog kev lag luam muab rho tawm los ntawm uranium-bearing minerals xws li uraninite. … Txawm li cas los xij, vim muaj qhov me me nyob hauv qhov xwm txheej, uranium yuav tsum tau ua kom muaj zog kom txaus uranium-235 tam sim no.
Pom zoo:
Yuav ua li cas sau ntawv thiab yuav ua li cas?
Tab sis tiag tiag, sau ntawv tsuas yog txhais tau tias tso tseg me ntsis nyob ntsiag to, tsis muaj sijhawm los zaum thiab xav txog koj lub neej. Nws tuaj yeem yog los ntawm kev sau cov ntaub ntawv ntawm qhov koj tau ua hnub ntawd; los ntawm venting txog ib yam uas koj tsis tuaj yeem tawm ntawm koj lub siab;
Puas yog uranium ua hluav taws xob?
Thaum ua kom zoo dua, uranium yog xim dawb, tsis muaj zog hlau tsis muaj zog. Nws muaj Mohs hardness ntawm 6, txaus los khawb iav thiab kwv yees li sib npaug ntawm titanium, rhodium, manganese thiab niobium. Nws yog malleable, ductile, me ntsis paramagnetic, muaj zog electropositive thiab tsis zoo hluav taws xob conductor.
Yuav tsum uranium ua peev?
Nco ntsoov tias rau cov ntsiab lus tshuaj no siv rau lo lus nkaus xwb thiab tsis yog cov cim tshuaj, uas yog ib txwm muaj peev txheej. … Nco ntsoov tias cov npe ntawm cov tshuaj khib lossis cov tshuaj tsis tshua muaj tsis muaj peev xwm ua tau zoo ib yam li cov khoom siv, thiab yog li uranium thiab plutonium (cov cim U thiab Pu) yuav tsum tsis muaj peev txheej zoo li carbon lossis hlau (cov cim C thiab Fe).
Thaum twg uranium atom cais tawm dab tsi?
Atoms ntawm uranium raug faib ua ob lub me me. Lub zog ntxiv yog tso tawm raws li heat. Qhov cua sov no yog siv los ua hluav taws xob. Yuav ua li cas thaum koj faib lub uranium atom? Kev sib cais ntawm uranium atom tso tawm lub zog.
Thaum uranium-238 raug foob nrog lub neutron?
Qhov ntau dua uranium-238 tsis raug fission thiab yog li tsis tuaj yeem siv los ua roj rau nuclear reactors. Txawm li cas los xij, yog tias uranium-238 tau tawg nrog cov neutrons (piv txwv li uranium-235), nws nqus cov neutronthiab hloov mus ua uranium-239.
