1. China Construction Eco‐Environmental Protection Technology Co., Ltd Suzhou 215100 P. R. China
2. MOE Key Laboratory of Wooden Material Science and Application and Key Laboratory of Wood Science and Engineering Beijing Forestry University Beijing 100083 P. R. China
3. Department of Radiation Oncology Peking University Cancer Hospital and Institute Beijing 100142 P. R. China
4. Chinese Academy of Forestry Research Institute of Wood Industry Beijing 100091 P. R. China