1. Institute of Nuclear Technology ApplicationsBeijing Radiation Center Beijing 100875 China
2. The Key Laboratory of Beam Technology and Materials Modification of the Ministry of EducationBeijing Normal University Beijing 100875 China
3. College of Nuclear Science and TechnologyBeijing Normal University Beijing 100875 China
4. Institute of Radiological ProtectionShandong Center for Disease Control and Prevention Jinan China
5. Institute of Architectural DesignNuclear Power Institute of China Chengdu 610000 China