Torium Dioxide (ThO2), ka kiia hokitorium(IV) waikura, he puna Thorium tino kore e taea te waiariki.He kirikiri toka, he ma, he kowhai ranei te tae.Kei te mohiotia ano ko te thoria, he mea hanga te nuinga hei hua-a-hua o te hanga lanthanide me te uranium.Ko te Thorianite te ingoa o te ahua kohuke o te thorium dioxide.Ko te Thorium he mea utu nui i roto i te hanga karaehe me te hanga karaehe hei whakangao kowhai kanapa na te mea ko tona whakaatanga tino pai.Ko nga pūhui hāora e kore e kawe ki te hiko.