铱-192后装治疗室内辐射剂量场水平及分布

Dose level and distribution of radiation field in iridium 192 afterloading therapy room

摘要

了解铱-192后装治疗室内部辐射剂量场水平；分布特性及迷道设计对辐射剂量场所起的屏蔽作用，为治疗室的辐射防护设计和人员安全评估提供科学依据。采用热释光剂量计（TLD）和辐射剂量监测仪，在铱-192后装机出束和贮源状态下，分别测量治疗室内不同位置，不同高度及不同距离下的辐射剂量场水平及分布。本研究通过实测和理论相结合的方法，获取精确的治疗室内部剂量场数值，并探讨了迷道结构对降低治疗室入口处辐射剂量的重要意义，为优化治疗室的设计和辐射防护措施，保证医护人员和患者的辐射安全提供了关键依据。

Abstract

Understanding the radiation dose field levels and distribution characteristics inside an iridium-192 brachytherapy treatment room, as well as the shielding effect of maze design on the radiation dose field, provides a scientific basis for the radiation protection design of the treatment room and personnel safety assessment. Thermoluminescent dosimeters (TLD) and radiation dose monitors were used to measure the radiation dose field levels and distribution at different positions, heights, and distances within the treatment room during both the source exposure and storage states of the iridium-192 afterloader. This study, through a combination of experimental measurements and theoretical analysis, obtained accurate internal dose field data of the treatment room and discussed the significant role of the maze structure in reducing radiation doses at the entrance. The findings provide critical insights for optimizing the design of the treatment room and radiation protection measures, ensuring the radiation safety of medical staff and patients.

关键词

后装治疗机 / 铱-192 / 累积剂量 / 辐射剂量场 / 分布特征

Key words

Afterloader / Iridium-192 / Cumulative dose / Radiation dose field / Distribution characteristics

参考文献

[1] 鲁玮瑗, 李智华, 黄菊英. 近距离后装治疗机及其在鼻咽癌治疗中的应用[J]. 医疗设备信息, 2006, (11): 50-51

[2] 马永忠, 娄云, 冯泽臣等. 关于《放射治疗机房的辐射屏蔽规范第3部分:γ射线源放射治疗机房》(GBZ/T 201.3-2014)技术指标解析[J]. 首都公共卫生, 2017, 11(5):228-234

[3] 中华人民共和国生态环境部. 环境γ辐射剂量率测量技术规范:HJ1157-2021[S]. 北京: 中国环境出版社, 2021

[4] 中华人民共和国国家健康卫生委员会. 放射治疗机房的辐射屏蔽规范第1部分: 一般原则: GBZ/T201.1-2007[S]. 北京: 中国标准出版社, 2007

[5] 国家卫生计生委. 放射治疗机房的辐射屏蔽规范第3部分:γ射线源放射治疗机房:GBZ/T201.3-2014[S]. 北京: 人民卫生出版社, 2014:1-21

[6] 李凤霜, 张朝, 李夏, 等. 后装γ源近距离治疗室内辐射场剂量水平及分布[J]. 职业与健康, 2018, 34(15): 2113-2117