250~500 kV X射线窄谱辐射质空气比释动能测量及剂量当量转换系数研究

辐射防护 ›› 2024, Vol. 44 ›› Issue (1): 19-26.

250~500 kV X射线窄谱辐射质空气比释动能测量及剂量当量转换系数研究

屈冰冰^1,2, 赵瑞², 吴金杰², 鲁平周^1,2, 李梦宇^1,2, 李婷², 马英杰¹

1.成都理工大学,成都 610059;
2.中国计量科学研究院,北京 100029

收稿日期:2023-02-16 出版日期:2024-01-20 发布日期:2024-02-05
通讯作者: 吴金杰。E-mail:wujj@nim.ac.cn
作者简介:屈冰冰(1995—),男,2018年毕业于东华理工大学核工程与核技术专业,获学士学位,现为成都理工大学和中国计量科学研究院联合培养核科学与技术专业在读硕士研究生。E-mail:178542193@qq.com
基金资助:
国家市场监督管理总局技术保障专项(2022YJ33)资助。

Study on air kerma measurement and conversion coefficient from air kerma to dose equivalent for 250-500 kV X-ray narrow spectrum

QU Bingbing^1,2, ZHAO Rui², WU Jinjie², LU Pingzhou^1,2, LI Mengyu^1,2, LI Ting², MA Yingjie¹

1. Chengdu University of Technology, Chengdu 610059;
2. National Institute of Metrology, Beijing 100029

Received:2023-02-16 Online:2024-01-20 Published:2024-02-05

摘要/Abstract

摘要： 辐射剂量仪表的准确测量是开展辐射防护工作的重要保障,根据ICRU中规定的实用量要求,需要在特定的参考辐射场中对其进行检定或校准。参考ISO 4037-1:2019,建立250~500 kV X射线窄谱系列参考辐射质,对所建辐射场的均匀性以及相应辐射质下的能谱进行研究。将由EGSnrc模拟的X射线能谱得到所建辐射质下的平均能量、分辨率以及实验测量得到的半值层值与ISO标准推荐值进行比较,结果均满足规范要求,表明新建辐射质准确可靠。利用A5电离室对新建辐射场中的空气比释动能进行测量,再根据X射线能谱信息计算得到的空气比释动能到剂量当量的转换系数,实现空气比释动能到周围剂量当量和个人剂量当量的转换,从而为各类辐射剂量仪表在该高能段的能量响应评价提供了测量条件,保证了量值的准确与可靠。

关键词: X射线, 窄谱辐射质, 空气比释动能, 剂量当量, 转换系数

Abstract: Accurate measurement of radiation dosimeter is an important guarantee for conducting radiation protection. According to the operational quantities in ICRU report, it is necessary to verify or calibrate it in the reference radiation field. Referring to the ISO 4037-1:2019, the narrow spectrum X-ray reference radiation quality in (250-500) kV was established, and the uniformity of the radiation field and the spectrum were studied. The spectrum and half value layer parameters of radiation quality were obtained by Monte Carlo simulation and experimental measurement, and were compared with the ISO recommended values. These results meet the requirements of the relevant specification, indicating that the new radiation quality is accurate and reliable. The A5 ionization chamber is used to measure the air kerma in the new radiation field. According to the conversion coefficient of the air kerma to dose equivalent calculated by the X-ray energy spectrum, the conversion of the air kerma to the ambient dose equivalent and the individual dose equivalent is realized, which provides the measurement conditions for the energy response evaluation of various radiation dose meters in the high-energy region, and ensures the accuracy and reliability of the measurement value.

Key words: X-ray, narrow spectrum radiation quality, air kerma, dose equivalent, conversion coefficient

中图分类号:

TL72

屈冰冰, 赵瑞, 吴金杰, 鲁平周, 李梦宇, 李婷, 马英杰. 250~500 kV X射线窄谱辐射质空气比释动能测量及剂量当量转换系数研究[J]. 辐射防护, 2024, 44(1): 19-26.

QU Bingbing, ZHAO Rui, WU Jinjie, LU Pingzhou, LI Mengyu, LI Ting, MA Yingjie. Study on air kerma measurement and conversion coefficient from air kerma to dose equivalent for 250-500 kV X-ray narrow spectrum[J]. RADIATION PROTECTION, 2024, 44(1): 19-26.

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