International SOS Clinic Nanjing. Address: 1st floor of Hilton Hotel, No.319 at Zhongshan Donglu. Opening hours. Monday to Friday 9am to 6pm. Saturday 24hr emergency care only.
Control Rods. The nuclear chain reaction may be controlled using a device called a control rod. Control rods are made of materials which absorb neutrons. Thus, when a control rod is inserted into a nuclear reactor it reduces the number of free neutrons available to cause the uranium atoms to fission.
Neutrons are also produced in the reaction. In order for a nuclear power plant to work properly, the number of neutrons must be carefully controlled. Rods containing gadolinium are raised out of or lowered into the reactor. This allows more or fewer neutrons to remain in the reaction. Gadolinium also has medical uses.