Actinium is found naturally in uranium ores as a decay product :
A tonne of uranium ore contains on average 0.2 g of actinium .
Ac can be extracted by ion-exchange or solvent extraction .
Reduction of AcF with lithium vapour at 1100-1300 °C :
AcF(s) + Li(g) Ac(s) + LiF(s)
Actinium can be made by the neutron bombardment of the radium isotope 226Ra :
At best, Ac can only be synthesized in mg quantities .