新型平板电离室的研制与初步测试

辐射防护 ›› 2022, Vol. 42 ›› Issue (1): 71-78.

新型平板电离室的研制与初步测试

孙铭言^1,2, 张伟华¹, 童腾¹, 李道武¹, 张易¹, 黄先超¹, 吕宁²

1.中国科学院高能物理研究所北京市射线成像技术与装备工程技术研究中心,北京 100049;
2.中国人民解放军火箭军工程大学,西安 710025

收稿日期:2021-06-15 出版日期:2022-01-20 发布日期:2022-01-24
作者简介:孙铭言(1997—),男,2019年毕业于火箭军工程大学工程物理专业,现为火箭军工程大学能源动力专业在读硕士研究生。E-mail:422591417@qq.com

Development and preliminary test of a novel plane-parallel ionization chamber

SUN Mingyan^1,2, ZHANG Weihua¹, TONG Teng¹, LI Daowu¹, ZHANG Yi¹, HUANG Xianchao¹, LV Ning²

1. Beijing Engineering Research Center of Radiographic Techniques and Equipment, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049;
2. Rocket Force University of Engineering, Xi'an 710025

Received:2021-06-15 Online:2022-01-20 Published:2022-01-24

摘要/Abstract

摘要： 研制一款同时测量质子束流与剂量的平板电离室。利用基于有限元分析的Ansys模拟软件和Geant4蒙特卡罗软件对电离室电场分布、等效水厚度、不同能量质子束穿过电离室后的横向散射等参数进行模拟,进而优化电离室结构。并利用YXLON 450 kV X射线管、6 MeV脉冲加速器与北京大学串列加速器对电离室进行初步测试,电离室运行稳定,射线位置二维分布信息采集准确,性能良好。

关键词: 束流二维分布监测, 平板电离室, Genat4, 有限元, 蒙特卡罗模拟

Abstract: A plane-parallel ionization chamber for position and dose detection of proton beam is developed. The ionization chamber structure is optimized by simulating the electric field distribution, equivalent water thickness, and lateral scattering of proton beams of different energies after passing through the ionization chamber using the FEM-based Ansys simulation software and Geant4 Monte Carlo toolkit. A YXLON 450 kV X-ray tube, 6 MeV pulse accelerator and Peking University tandem accelerator were used to conduct preliminary tests on the ionization chamber. The ionization chamber operated stably, and the information of 2-D distribution of rays and the collection of dose information were accurate and the performance was good.

Key words: beam 2-D distribution monitoring, plane-parallel ionization chamber, Genat4, finite element method, Monte Carlo simulation

中图分类号:

TL811+.1

孙铭言, 张伟华, 童腾, 李道武, 张易, 黄先超, 吕宁. 新型平板电离室的研制与初步测试[J]. 辐射防护, 2022, 42(1): 71-78.

SUN Mingyan, ZHANG Weihua, TONG Teng, LI Daowu, ZHANG Yi, HUANG Xianchao, LV Ning. Development and preliminary test of a novel plane-parallel ionization chamber[J]. RADIATION PROTECTION, 2022, 42(1): 71-78.

参考文献 14

[1]	刘玉连,赵徵鑫,张文艺,等.质子放射治疗的现状与展望[J].中国医学装备,2017,14(07):139-143.LIU Yulian, ZHAO Huixin, ZHANG Wenyi, et al. Current status and outlook of proton radiation therapy[J]. China Medical Equipment, 2017,14(07):139-143.
[2]	Yajima K, Kanai T, Kusano Y, et al. Development of a multi-layer ionization chamber for heavy-ion radiotherapy[J]. Physics in Medicine & Biology, 2009, 54(7):107-114.
[3]	Dhanesar S, Sahoo N, Kerr M, et al. Quality assurance of proton beams using a multilayer ionization chamber system[J]. Medical Physics, 2013, 40(9):092102.
[4]	Takahiro K, Kazuhiro A, Tatsuhiko S, et al. Patient-specific quality assurance for proton depth dose distribution using a multi-layer ionization chamber in a single-ring wobbling method[J]. Radiological Physics and Technology, 2019, 12(3):305-311.
[5]	Herzen J, Todorovic M, Cremers F, et al. Dosimetric evaluation of a 2D pixel ionization chamber for implementation in clinical routine[J]. Physics in Medicine & Biology, 2007, 52(4):1197.
[6]	Poppe B, Blechschmidt A, Djouguela A, et al. Two-dimensional ionization chamber arrays for IMRT plan verification[J]. Medical Physics, 2006, 33(4):1005-1015.
[7]	屈伟强,汪延明,赵鹏,等.二维电离室矩阵与胶片在调强放射治疗的剂量验证结果比较[J].实用医药杂志,2013,30(10):875-876.QU Weiqiang, WANG Yanming, ZHAO Peng, et al. Dosimetric verification of the intensity modulated radiation therapy: Comparative analysis of applications of 2D-array ionization chamber and film[J]. Journal of Practical Medicine,2013,30(10):875-876.
[8]	Basile E, Carloni A, Castelluccio D M, et al. An online proton beam monitor for cancer therapy based on ionization chambers with micro pattern readout[J]. Journal of Instrumentation, 2012, 7(03):C03020.
[9]	Cisbani E, Carloni A, Colilli S, et al. Beam micro pattern ionization chamber with adaptive amplifiers as dose delivery monitor for the therapeutic proton LINAC[R].Barcelona, Spain,2016.
[10]	王瑞禛, 王和义, 陈志林,等.基于有限元方法计算多丝电离室的电场构型[J].原子能科学技术, 2018, 52(10):114-119.WANG Ruizhen, WANG Heyi, CHEN Zhilin, et al. Calculation of electric field for multi-wire ionization chamber using finite element method[J]. Atomic Energy Science and Technology, 2018, 52(10):114-119.
[11]	Allison J, Amako K, Apostolakis J, et al. Geant4 developments and applications[J]. IEEE Transactions on Nuclear Science, 2006, 53(1):270-278.
[12]	Bortfeld T. An analytical approximation of the Bragg curve for therapeutic proton beams[J]. Medical Physics, 1998, 24(12):2024-2033.
[13]	谢朝,邹炼,侯氢,等.质子束治疗中非均匀组织的等效水厚度修正研究[J].物理学报,2013,62(6):483-487.XIE Chao, ZOU Lian, HOU Qing, et al. Equivalent water thickness correction study of non-homogeneous tissue in proton beam therapy[J]. Journal of Physics,2013,62(06):483-487.
[14]	易均辉, 莫惠媚, 龚福忠,等. 巧用Origin软件处理物理化学实验数据[J]. 实验室研究与探索, 2009, 28(8):56-59.YI Junhui, MO Huimei, GONG Fuzhong, et al. The smart application of Origin software in the data processing of physical chemistry experiment[J]. Laboratory Research and Exploration, 2009, 28(8):56-59.