Thorium in commercially available rare earth compounds.
D002563:Cerium / Q000032:analysis; D007811:Lanthanum / Q000032:analysis; D008674:Metals, Rare Earth / Q000032:analysis*; D009354:Neodymium / Q000032:analysis; D013910:Thorium / Q000032:analysis*; D014501:Uranium / Q000032:analysis
D008674:Metals, Rare Earth; D009354:Neodymium; D002563:Cerium; D014501:Uranium; D013910:Thorium; D007811:Lanthanum