**3.2 Depleted uranium shell**

In the conceptual design of a subcritical blanket based on thorium, the neutrons from the U reaction process are used to maintain the Th/U fuel cycle. The depleted uranium (DU) shell is adopted for studying Th reaction. The IR/OR of the DU shell is 131/300 mm [12]. Six slices of ThO2 samples are put in the radial channel at 90° to the incident D+ beam, as shown in **Figure 2**. ThO2 samples are foils made from ThO2 powder filling a plexiglass box with IR/OR of 9/9.5 mm. The mass of ThO2 powder is about 0.45 g, and the thickness is about 0.7 mm. The D-T neutron source is located in the center of the shell.
