The project was supported by the National Natural Science Foundation of China91226112;Specialized Research Fund for the Doctoral Program of Higher Education of China20110001120121;Coordinated Research Projects of International Atomic Energy Agency CRP Research Contract No.15107.国家自然科学基金91226112;高等学校博士学科点专项科研基金20110001120121;国际原子能机构CRP Research Contract 15107