摘要
目的对新型冠状病毒肺炎疫情期间应急使用的CT方舱辐射安全风险进行评估,保证CT方舱安全运行,为放射工作人员、患者和公众的辐射安全提供保障。方法依据GBZ 130-2020等国家标准,在CT方舱安装完成后使用ATOMTEX AT1123型辐射剂量监测仪对集成式方舱与组装型方舱的散漏放射线进行放射性防护检测,检测部位包括工作人员操作位、电缆沟、铅玻璃观察窗、工作人员防护门、受检者防护门和四周墙体,对超标部位使用铅板增强屏蔽能力。根据检测结果分析疫情期间CT方舱辐射防护的可行性管理办法,从而建立、健全医院的放射防护和安全管理制度。结果经检测,组装型方舱的屏蔽体外辐射剂量水平满足国家标准要求(当量率不大于2.5μSv/h),集成式方舱在整改后亦能满足国家标准要求,但是集成式方舱受检者防护门外最大辐射剂量当量是组装型方舱的10.2倍,在防护门的下缝位置;集成式方舱四周墙体外最大辐射剂量当量是组装型方舱的4.6倍,主要位于墙体的搭接处。结论CT方舱机房防护能够满足国家标准要求,但由于方舱结构的特殊性,需加强辐射防护监测和安全管理,保证辐射防护最优化和限制个人当量剂量,有效提升应急放射设备的辐射防护和安全管理水平。
Objective To evaluate radiation safety risk and ensure safe operation of CT shelter in COVID-19 epidemic prevention and control. Methods According to national standards GBZ 130-2020, the ATOMTEX AT1123 radiation dose monitor was used to measure radiation dose rate of standard and assembled mobile cabin after installation of CT shelter, measuring parts were included staff operating position, cable trench, lead glass observation window, staff protective door, subject protective door and surrounding wall, lead sheets were used to enhance shielding over standard areas. The feasible management methods for radiation protection of CT shelter during the epidemic by test results were analyzed, the radiation protection and safety management system of hospital were established and improved. Results The test results showed that shielded external radiation dose level of assembled shelter met the national standards(≤ 2.5 μSv/h). The maximum radiation dose equivalent outside protective door of the integrated shelter was 10.2 times that of the assembled shelter, and under protective door. The maximum radiation dose equivalent outside the surrounding walls of integrated shelter was 4.6 times that of assembled shelter,mainly at wall joints. Conclusion It is demonstrated that the protection performance of CT shelter meets the national standards. Meanwhile, radiation protection monitoring and safety management should be reinforced to effectively ensure radiation protection and improve the safety management level of emergency radiological equipment.
作者
张文龙
董硕
黄岗
吴航
白玫
ZHANG Wen-long;DONG Shuo;HUANG Gang;WU Hang;BAI Mei(Department of Medical Engineering,Xuanwu Hospital,Capital Medical University,Beijing 100053,China)
出处
《生物医学工程与临床》
CAS
2022年第3期365-369,共5页
Biomedical Engineering and Clinical Medicine
