14 MeV快中子照相准直屏蔽系统的设计与优化
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摘要
基于强流氘氚中子源科学装置HINEG设计了一套快中子照相准直屏蔽系统。采用中子输运设计与安全评价软件系统SuperMC和ENDF/B-Ⅶ.0数据库计算了准直中子束的中子能谱及注量率、γ射线能谱及注量率、直射中子注量率与γ射线注量率比值(φ_d/φ_γ)、直射与散射中子注量率比值(φ_d/φ_s)、准直束中子注量率的不均匀度等特性参数,并采用MCNP5程序进行了对比验证。研究了准直屏蔽系统的内衬材料、尺寸等对特性参数的影响规律,并通过优化获取了最优设计方案。计算结果显示,在同等计算条件下,SuperMC计算结果与MCNP计算结果相对偏差小于1%,准直屏蔽系统的φ_d/φ_γ为50.1,φ_d/φ_s为5.7,在?30 cm视野范围内的中子注量率为4.80×10~7 cm~(-2)·s~(-1),其中直射中子注量率为4.09×10~7 cm~(-2)·s~(-1),中子注量率不均匀度为5.8%,满足快中子照相对准直束特性参数的要求。
A shielding collimator system of fast neutron radiography was designed based on High Intensity D-T Fusion Neutron Generator. The beam characteristic parameters of the shielding collimator system, including neutron energy spectrum and fluence rate, γ-ray energy spectrum and fluence rate, direct neutron fluence rate and gamma fluence rate ratio(φ_d/φ_γ), direct neutron fluence rate and scattered neutron fluence rate ratio(φ_d/φ_s) and neutron fluence rate uniformity were calculated by SuperMC code coupled with ENDF/B-Ⅶ.0 library, and the MCNP5 code was used to verify the results. The lining material and its thickness of the shielding collimator system were studied aiming to acquire the optimal design. The results show that the deviation between the calculated results of SuperMC and MCNP is less than 1% under the same condition, and the φ_d/φ_γ, φ_d/φ_s, the total neutron fluence rate within ?30 cm, φ_d and its uniformity are about 50.1, 5.7, 4.80×10~7 cm~(-2)·s~(-1), 4.09×10~7 cm~(-2)·s~(-1) and 5.8% respectively, which can meet the need of fast neutron radiography facility.
A shielding collimator system of fast neutron radiography was designed based on High Intensity D-T Fusion Neutron Generator. The beam characteristic parameters of the shielding collimator system, including neutron energy spectrum and fluence rate, γ-ray energy spectrum and fluence rate, direct neutron fluence rate and gamma fluence rate ratio(φ_d/φ_γ), direct neutron fluence rate and scattered neutron fluence rate ratio(φ_d/φ_s) and neutron fluence rate uniformity were calculated by SuperMC code coupled with ENDF/B-Ⅶ.0 library, and the MCNP5 code was used to verify the results. The lining material and its thickness of the shielding collimator system were studied aiming to acquire the optimal design. The results show that the deviation between the calculated results of SuperMC and MCNP is less than 1% under the same condition, and the φ_d/φ_γ, φ_d/φ_s, the total neutron fluence rate within ?30 cm, φ_d and its uniformity are about 50.1, 5.7, 4.80×10~7 cm~(-2)·s~(-1), 4.09×10~7 cm~(-2)·s~(-1) and 5.8% respectively, which can meet the need of fast neutron radiography facility.
引文
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[16] 曹琴琴.d-D和d-T中子源中子照相慢化准直屏蔽系统模拟设计[D].兰州:兰州大学,2005.
[17] 张杰,王俊润,张宇,等.基于D-T紧凑型中子源的快中子照相准直屏蔽体设计及中子束特性模拟研究[J].原子核物理评论,2017,34(4):762-767.ZHANG Jie,WANG Junrun,ZHANG Yu,et al.BSA design and simulation of the beam characteristic for the fast neutron radiography based on a compact neutron generator[J].Nuclear Physics Review,2017,34(4):762-767(in Chinese).
[2] 蒋诗平,陈亮,陈阳,等.快中子照相的实验研究[J].核技术,2005,28(2):151-154.JIANG Shiping,CHEN Liang,CHEN Yang,et al.Experimental study on fast neutron radiography[J].Nuclear Techniques,2005,28(2):151-154(in Chinese).
[3] TANG B,ZHOU C,HUO H,et al.The pilot experimental study of 14 MeV fast neutron digital radiography[J].Science in China Series G:Physics Astronomy,2009,52(9):1 330-1 336.
[4] 鲁昌兵,许鹏,鲍杰,等.快中子照相模拟分析与实验验证[J].物理学报,2015,64(19):402-408.LU Changbing,XU Peng,BAO Jie,et al.Simulation analysis and experimental verification of fast neutron radiography[J].Acta Physica Sinica,2015,64(19):402-408(in Chinese).
[5] 吴宜灿,刘超,宋钢,等.强流氘氚聚变中子源HINEG设计研究[J].核科学与工程,2016,36(1):77-83.WU Yican,LIU Chao,SONG Gang,et al.Design study of high intensity D-T fusion neutron generator HINEG[J].Nuclear Science and Engineering,2016,36(1):77-83(in Chinese).
[6] WU Y.Development of high intensity D-T fusion neutron generator HINEG[J].International Journal of Energy Research,2018,42:68-72.
[7] WU Y,CHEN Z,HU L,et al.Identification of safety gaps for fusion demonstration reactors[J].Nature Energy,2016,1(12):16154.
[8] 貂大卫,刘以思,金光宇,等.中子照相[M].北京:原子能出版社,1996:22-50.
[9] BERGAOUI K,REGUIGUI N,GARY C K,et al.Design,testing and optimization of a neutron radiography system based on a deuterium-deuterium (D-D) neutron generator[J].Journal of Radioanalytical & Nuclear Chemistry,2014,299(1):41-51.
[10] 刘洋,沈飞,杨尧,等.D-T快中子照相准直屏蔽体设计及中子束特性模拟研究[J].核技术,2011,33(4):273-277.LIU Yang,SHEN Fei,YANG Yao,et al.Simulation of BSA design and beam characteristic for fast neutron radiography using a D-T neutron source[J].Nuclear Techniques,2011,33(4):273-277(in Chinese).
[11] FANTIDIS J G,POTOLIAS K,BANDEKAS D V,et al.Nondestructive testing of medium and high voltage cables with a transportable radiography system[J].Journal of Engineering Science & Technology Review,2010,3(1):90-94.
[12] 吴洋,窦海峰,唐彬,等.小型中子源高能中子照相装置准直屏蔽系统设计[J].核动力工程,2013,34(4):149-152.WU Yang,DOU Haifeng,TANG Bin,et al.Conception design of shielding collimator system for high energy neutron radiography with mini-type neutron source[J].Nuclear Power Engineering,2013,34(4):149-152(in Chinese).
[13] 窦海峰,唐彬,吴洋.D-T中子源快中子照相准直屏蔽系统设计[J].核技术,2010,33(10):754-759.DOU Haifeng,TANG Bin,WU Yang.Design of a shielding collimator system for fast neutron radiography with D-T neutron source[J].Nuclear Techniques,2010,33(10):754-759 (in Chinese).
[14] SABO-NAPADENSKY I,WESISSBABAI R,GAYER A,et al.Research and development of a dedicated collimator for 14.2 MeV fast neutrons for imaging using a D-T generator[J].Journal of Instrumentation,2012,7(6):69-77.
[15] 吴宜灿,宋婧,胡丽琴,等.超级蒙特卡罗计算仿真软件系统SuperMC[J].核科学与工程,2016,36(1):62-71.WU Yican,SONG Jing,HU Liqin,et al.Super Monte Carlo simulation program for nuclear and radiation process:SuperMC[J].Nuclear Science and Engineering,2016,36(1):62-71 (in Chinese).
[16] 曹琴琴.d-D和d-T中子源中子照相慢化准直屏蔽系统模拟设计[D].兰州:兰州大学,2005.
[17] 张杰,王俊润,张宇,等.基于D-T紧凑型中子源的快中子照相准直屏蔽体设计及中子束特性模拟研究[J].原子核物理评论,2017,34(4):762-767.ZHANG Jie,WANG Junrun,ZHANG Yu,et al.BSA design and simulation of the beam characteristic for the fast neutron radiography based on a compact neutron generator[J].Nuclear Physics Review,2017,34(4):762-767(in Chinese).