control rod and safety rod which is key part in nuclear reactor.

Nuclear energy is paid more attention to be developed as energy in the world. In order to control speed of nuclear reaction in nuclear reactor, it is necessary to make absorber rod with material to absorb neutron, to be called control rod and safety rod which is key part in nuclear reactor. For boron carbide with a large neutron absorption cross section has a strong ability to absorb neutron, it is widely applicable to nuclear industry as material of neutron absorption and shield.