国内首台单间室质子治疗系统场所辐射水平的测量与评估  

Measurements and assessment of radiation levels at the radiotherapy site of the first domestic single-vault proton therapy system

作　　者：郑仁超 杨想军[2] 卢晓光 吴韦清 彭知义 胡广原 袁响林 Zheng Renchao;Yang Xiangjun;Lu Xiaoguang;Wu Weiqing;Peng Zhiyi;Hu Guangyuan;Yuan Xianglin(Department of Oncology,Tongji Hospital Affiliated to Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430030,China;Hubei Provincial Center for Disease Control and Prevention,Wuhan 430079,China;Research Institute of Tsinghua University of Shenzhen,Shenzhen 518063,China)

机构地区：[1]华中科技大学同济医学院附属同济医院肿瘤科,武汉430030 [2]湖北省疾病预防控制中心,武汉430079 [3]深圳清华大学研究院精准放射诊疗技术研发中心,深圳518063

出　　处：《中华放射医学与防护杂志》2024年第10期879-885,共7页Chinese Journal of Radiological Medicine and Protection

基　　金：湖北省科技计划项目(2023BCB096)。

摘　　要：目的:测量并评估国内首台单间室质子治疗系统场所内的相关辐射剂量。方法:测量治疗系统出束时和停束后治疗场所的辐射水平,并评估场所内人员年有效剂量。结果:出束过程中,探测到最高辐射剂量在设备层防护门处,γ辐射水平为2.140μSv/h,中子辐射水平为0.850μSv/h。束流停止后,中子辐射随即消失,活化产物的辐射以γ射线为主,同一地点停束时间越长,感生辐射强度越低。同一时间与受照物体的距离越远,感生辐射强度越低。评估所有人员受照年有效剂量均处于安全水平,其中物理师最高,为2.138 mSv。结论:本中心质子治疗场所辐射水平符合要求,可以安全开展质子治疗工作。Objective To measure and assess relevant radiation doses at the radiotherapy site of the first domestic single-vault proton therapy system.Methods The radiation levels of the therapy system during and after beam irradiation were measured,and annual effective doses were assessed for personnel at the site.Results During beam irradiation,the highest radiation dose was detected at the shielded door of the equipment floor,with a gamma radiation level of 2.140μSv/h and a neutron radiation level of 0.850μSv/h.Neutron radiation disappeared immediately once the beams stopped.In contrast,the radiation activated originated mostly from gamma rays.A longer time after beams stopped was associated with lower induced radiation intensity at the same location.Furthermore,a farther distance from the irradiated object corresponded to lower induced radiation intensity at the same time.The assessment result reveal that the annual effective doses to the personnel were at the safe level,with physicists exposed to the highest dose of 2.138 mSv.Conclusions The radiation level at the studied proton therapy site meets the safety requirement,and the treatment can be performed safely at this site.

关 键 词：单间室 质子 治疗场所 辐射水平 

分 类 号：R817.5[医药卫生—影像医学与核医学]