Department of Radiation Protection, Beijing Center for Disease Prevention and Control, Beijing Research Center for Preventive Medicine, Beijing, China.
Radiat Prot Dosimetry. 2021 May 17;193(3-4):133-136. doi: 10.1093/rpd/ncab042.
Radiation measurements were conducted at 22 cabinet X-ray systems in Beijing, China, between 2015 and 2019. The median dose rates in the closed-drapes position were 0.11, 0.14, 0.12, 0.14, 0.34 and 0.17 μGy h-1 at the operator position and 5 cm from the surface of the left side, right side, top, entrance and exit, respectively. When a scattering object was passed through the entrance/exit (open-drapes position), the dose rates of eight systems ranged from 1.19 to 6.72 μGy h-1 (median: 3.75 μGy h-1). From 2015 to 2019, we monitored the personal dose equivalent Hp (10) 589 times. The personal dose equivalent of three workers exceeded 1 mSv year-1. However, the integrity of equipment shielding needs to be checked regularly to ensure safe operation. The regulation of radiation protection by employers, technician support institutes or government departments is thus warranted to limit the radiation exposure of workers and the public.
在中国北京的 22 个 X 射线机柜中进行了辐射测量，时间跨度为 2015 年至 2019 年。在封闭帘位置，操作人员位置和距离左侧、右侧、顶部、入口和出口表面 5 厘米处的剂量率中位数分别为 0.11、0.14、0.12、0.14、0.34 和 0.17 μGy h-1。当散射物体穿过入口/出口（打开帘位置）时，八个系统的剂量率范围为 1.19 至 6.72 μGy h-1（中位数：3.75 μGy h-1）。从 2015 年到 2019 年，我们监测了个人剂量当量 Hp（10）589 次。有三名工人的个人剂量当量超过 1 mSv 年-1。然而，需要定期检查设备屏蔽的完整性，以确保安全运行。因此，雇主、技师支持机构或政府部门应制定辐射防护法规，以限制工人和公众的辐射暴露。
