现场校准用便携式X射线照射装置的优化设计及辐射特性研究

辐射防护 ›› 2021, Vol. 41 ›› Issue (2): 97-104.

现场校准用便携式X射线照射装置的优化设计及辐射特性研究

徐阳, 林敏, 高飞, 倪宁, 张曦

中国原子能科学研究院计量与校准技术重点实验室,北京 102413

收稿日期:2020-05-21 出版日期:2021-03-20 发布日期:2021-05-07
通讯作者: 林敏。E-mail:minlin716@126.com
作者简介:徐阳(1992—),女,2015年毕业于成都理工大学核工程与核技术专业,2018年毕业于成都理工大学核技术及应用专业,获硕士学位,现为中国原子能科学研究院在读博士,研究实习员。E-mail:1713621574@qq.com

Optimization design of portable X-ray irradiation device for on-site calibration and study of its radiation characteristics

XU Yang, LIN Min, GAO Fei, NI Ning, ZHANG Xi

China Institute of Atomic Energy, Key Laboratory of Metrology and Calibration Technology, Beijing 102413

Received:2020-05-21 Online:2021-03-20 Published:2021-05-07

摘要/Abstract

摘要： 中国原子能科学研究院计量测试部研制了一款用于校准现场固定式X、γ辐射剂量仪的便携式X射线照射装置。首先利用蒙特卡罗软件建立模型,对出射口准直光阑结构进行优化设计,随后,对所建参考辐射场射束范围、均匀性及散射辐射进行模拟计算,并利用TW32005电离室进行了实验验证。在本研究所选辐射质、管电流及参考点-焦斑距离条件下,所建立的辐射场能量范围为60～164 keV,空气比释动能率在0.08～565 mGy/h,周围剂量当量率在0.13～892 mSv/h,为后续利用便携式X射线照射装置开展现场校准技术研究奠定了基础。结果表明,经优化设计后的准直光阑在满足准直限束需求的同时有效减轻了自身重量,便携式X射线参考辐射场特性满足GB/T 12162.1—2000要求,验证了所建模型的正确性及蒙特卡罗方法用于便携式X射线参考辐射场特性研究的有效性。

关键词: 便携式X射线照射装置, 限束光阑, 参考辐射场, 蒙特卡罗

Abstract: A portable X-ray irradiation device for on-site calibration of fixed x and γ-ray radiation dosimeters has been developed by the Division of Radiation Metrology of China Institute of Atomic Energy. Firstly, the Monte Carlo method was used to establish the model and optimize the structure of the beam collimating aperture. Then, the reference radiation field range, uniformity and scattering radiation were simulated and verified by the TW32005 ionization chambers. The results show that the optimized aperture can effectively reduce its weight while meeting the requirements of beam collimating. The characteristics of portable X-ray reference radiation field meet the requirements of relevant standards. The portable X-ray reference radiation field characteristics meet the requirements of GB/T 12162.1. The correctness of the model and the effectiveness of the Monte Carlo method in the study of the characteristics of the portable X-ray reference radiation field are verified. The energy range of the radiation field is 60-164 keV, the air kerma rate is 0.08-565 mGy/h, and the ambient dose equivalent rate is 0.13-892 mSv/h. The result lays the foundation for the follow-up study of the on-site calibration technology using the portable X-ray irradiation device.

Key words: portable X-ray irradiation device, beam collimating aperture, reference radiation field, Monte Carlo

中图分类号:

TL84

徐阳, 林敏, 高飞, 倪宁, 张曦. 现场校准用便携式X射线照射装置的优化设计及辐射特性研究[J]. 辐射防护, 2021, 41(2): 97-104.

XU Yang, LIN Min, GAO Fei, NI Ning, ZHANG Xi. Optimization design of portable X-ray irradiation device for on-site calibration and study of its radiation characteristics[J]. RADIATION PROTECTION, 2021, 41(2): 97-104.

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