A lot of people worry about that the terrorists will make nuclear terror to jeopardize people's wealthy and property to reach their terrorist goals for disturbing social system and beating economy by attacking nuclear facilities or dispersing radioactive materials after 9.

Based upon monitoring results of radioactive materials in tunnel excavation construction in Qinling Tunnel the intensity of radioactivity and distribution regularities is summarized, meanwhile, preliminary assessment and research are conducted for radiation hazard and protection.

Radioactive materials inspection system which is applied to inspect the horror activities of radioactive materials and its illegal transfer.

Illicit trafficking of nuclear materials and other radioactive materials will result in serious threaten to society in the case of nuclear and radiological terrorism.

The actual engineering operation applying the method of chlorine dioxide disinfection and activated carbon adsorption,for removal of alpha and beta radioactive matters in certain drinking water source,was discussed,providing a new method for removing radioactive matters in the groundwater.

The suggests about standard of limit on radioactive substance in building materials;