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Thethreenaturally-occurringactinidealphadecaychainsgivenbelow—thorium,uranium/radium(fromU-238),andactinium(fromU-235)—eachendswithits ...
Uranium(92U)isanaturallyoccurringradioactiveelementthathasnostableisotope.Ithastwoprimordialisotopes,uranium-238anduranium-235, ...
跳到Uranium-238-Uranium-238isalsoimportantbecauseitisfertile:itabsorbsneutronstoproducearadioactiveisotopethatsubsequently ...
Italsocanbeusedinnuclearweapons.Depleteduranium(uraniumcontainingmostlyU-238)canbeusedforradiationshieldingorasprojectilesinarmor- ...
Uranium-238,themostprevalentisotopeinuraniumore,hasahalf-lifeofabout4.5billionyears;thatis,halftheradioactiveatomsinanysamplewill ...
Uranium-238isfissionablebyfastneutrons,andisfertile,meaningitcanbetransmutedtofissileplutonium-239inanuclearreactor.Anotherfissileisotope ...
Uranium-238isfissionablebyfastneutrons,andisfertile,meaningitcanbetransmutedtofissileplutonium-239inanuclearreactor.Anotherfissileisotope, ...
Uranium-238andUranium-235aretheparentisotopesofdecaychainsthatcanbeusedtoprovideachronologybackto∼500ky.Inanoldsystem(≫500ky)a ...
DUisuranium,primarilycomposedoftheisotopeuranium-238(U-238).Naturaluraniumisapproximately99.27%U-238,0.72%U-235,and0.0055%U-234.
Thehalf-lifeofuranium238isof4.5billionyears,whileuranium235hasahalf-lifeof'only'700millionyears.ThoughbothisotopeswereatthetimeofEarth ...