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== Rasprostrenjenost ==
Može se naći samo u tragovima u rudama [[uranij]]a. Jedna tona rude uranija sadrži oko 0,2 miligrama izotopa <sup>227</sup>Ac<ref name=j1/><ref name=g946/> dok jedna tona rude [[torij]]a sadrži oko 5 nanograma izotopa <sup>228</sup>Ac. Izotop <sup>227</sup>Ac je prelazni član raspadnog lanca uranij-aktinijevog niza koji počinje sa "roditeljskim" izotopom uranija-235 (ili [[plutonij]]a <sup>239</sup>Pu) a završava sa stabilnim [[Izotopi olova|izotopom olova]] <sup>207</sup>Pb. Izotop <sup>228</sup>Ac je prelazni član torijevog niza raspada, koji započinje "roditeljskim" izotopom <sup>232</sup>Th a završava stabilnim izotopom olova <sup>208</sup>Pb. Još jedan izotop aktinija (<sup>225</sup>Ac) je prelazni član u neptunijevom nizu raspada, a koji počinje sa <sup>237</sup>Np (ili <sup>233</sup>U) a završava sa [[talij]]em (<sup>205</sup>Tl) i (gotovo) stabilnim [[bizmut]]om (<sup>209</sup>Bi), mada je ovaj lanac raspada postojao samo u ranoj fazi nastanka [[Sunčev sistem|Sunčevog sistema]] zbog vrlo kratkog vremena poluraspada izotopa neptunija-237.
 
== Dobijanje ==
Mala prirodna koncentracija i fizičke i hemijske osobine koje su vrlo bliske onima kod lantana i drugih lantanoida, a koje su vrlo bogate u rudama koje u svom sastavu imaju tragove aktinija, čine izdvajanje ovog elementa iz ruda vrlo nepraktičnim, a povrh toga potpuno izdvajanje nikad nije postignuto.<ref name=j2/> Iz tih razloga, aktinij u miligramskim količinama dobija se zračenjem neutronima izotopa [[radij]]a <sup>226</sup>Ra u [[nuklearni reaktor|nuklearnom reaktoru]].<ref name=g946/><ref name="Emeleushj"/>
:<math chem>\begin{matrix}{}\\
\ce{{^{226}_{88}Ra} + ^{1}_{0}n -> ^{227}_{\ 88}Ra ->[\beta^-][42.2 \ \ce{min}] ^{227}_{89}Ac}\\
{}\end{matrix}</math>
Ova reakcija ima prinos od oko 2% od težine upotrebljenog radija. <sup>227</sup>Ac može kasnije i dalje "hvatati" neutrone što rezultira nastankom malih količina <sup>228</sup>Ac. Nakon sinteze, aktinij se odvaja od radija kao i od proizvoda raspada i nuklearne fuzije, poput torija, polonija, olova i bizmuta. Ekstrakcija se vrši pomoću vodenog rastvora tenoiltrifluoroaceton-[[benzen]]a iz rastvora proizvoda zračenja, a selektivnost prema određenom elementu postiže se podešavanjem [[pH]] vrijednosti rastvora (oko 6,0 za aktinij).<ref name=j1/> Alternativni način jeste izmjena aniona sa odgovarajućom smolom u dušičnoj kiselini, čime se može postići faktor razdvajanja od 1.000.000 za radij i aktinij u odnosu na torij u dvostepenom procesu. Nakon toga aktinij se razdvaja od radija odnosom od približno 100, koristeći smolu sa slabom kationskom izmjenom niskog poprečnog vezivanja te dušičnu kiselinu kao eluant.<ref name=sep/>
 
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