T 0150 (OTTO) Thulium(III) oxide, 99.99% Cas 12036-44-1 - used in the manufacturing of portable X-ray transmission device. T 0150 (OTTO) Thulium(III) oxide, 99.99% Cas 12036-44-1 - used as a nuclear reactor control material. Nanostructured thulium oxide acts as an efficient biosensor in the field of medicinal chemistry.