Investigation on the use and protection of X-ray machines of pet hospital in Beijing
XIE Weiyi, LI Yuxiang, ZHU Kai, ZHANG Guiying, NIU Dongsheng
中国辐射卫生 . 2020, (6): 653 -656 .  DOI: 10.13491/j.issn.1004-714X.2020.06.019