New gamma rays following the 233 U α-decay

233U α-decay was reinvestigated using a radiochemically purified source and high efficiency HPGe coaxial detectors; the lowenergy γ-spectrum was also measured using a LEPS detector. The energy and intensity values of one hundred sixty three γ-lines were determined, from which forty eight are newly reported with respect to the last study of Canty et al. A revised229Th level scheme was built, using the Ritz combination principle, in which nine levels are newly observed, at 371.3, 381.8, 465.5, 569.2, 584.9, 605.1, 620.8, 656.9 and 749.9 keV.