基于可移动紧凑加速器D-T中子源的热中子层析实验研究
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摘要
中子照相是十分重要的无损检测方法之一,尤其是针对含氢材料、同位素等的无损检测,中子照相技术具有其他射线成像不可比拟的优势。中国工程物理研究院核物理与化学研究所基于紧凑型D-T中子源,研发了可移动中子成像检测仪,成功实现了热中子照相和快中子照相实验检测。为确定基于该装置开展热中子层析检测的可行性,本文进行了数值模拟计算,利用该仪器开展了针对轻重材料模拟件的热中子层析成像实验,利用采集的181幅投影图像,在图像信噪较低和采集幅数较少条件下,成功重建了铝和聚乙烯材料包裹下的0.2 mm直径的钆丝。
Neutron radiography(NR) is one of the most important nondestructive testing methods, which could be applied in nondestructive testing of hydrogen containing materials, isotopes and so on. Institute of Nuclear Physics and Chemistry of China Academy of Engineering Physics has constructed a multi-use neutron imaging facility based on D-T neutron source with mobile compact accelerator, which could realize thermal neutron radiography and fast neutron radiography. Thermal neutron tomography parameters based on this facility were confirmed with numerical simulation method. With 181 collected radiography images and test object made of aluminum, polyethylene and gadolinium, and overcoming the conditions of less collected radiography images and low signal to noise ratio in the raw pictures, gadolinium line with diameter of 0.2 mm in the aluminum and polyethylene structure was successfully reconstructed.
Neutron radiography(NR) is one of the most important nondestructive testing methods, which could be applied in nondestructive testing of hydrogen containing materials, isotopes and so on. Institute of Nuclear Physics and Chemistry of China Academy of Engineering Physics has constructed a multi-use neutron imaging facility based on D-T neutron source with mobile compact accelerator, which could realize thermal neutron radiography and fast neutron radiography. Thermal neutron tomography parameters based on this facility were confirmed with numerical simulation method. With 181 collected radiography images and test object made of aluminum, polyethylene and gadolinium, and overcoming the conditions of less collected radiography images and low signal to noise ratio in the raw pictures, gadolinium line with diameter of 0.2 mm in the aluminum and polyethylene structure was successfully reconstructed.
引文
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[2] LEHMANN E H, VONTOBEL P, HERMANN A, et al. Non-destructive analysis of nuclear fuel by means of thermal and cold neutrons[J]. Nuclear Instruments and Methods in Physics Research A, 2003, 515(1): 745-759.
[3] BENNETT L G, BICKERTON M L, LEWIS W J, et al. Development of techniques for the neutron radiography of CF188 flight control surfaces[J]. Nuclear Instruments and Methods in Physics Research A, 1999, 424(1): 104-112.
[4] LEHMANN E H, KAESTNER A, JOSIC L, et al. Imaging with cold neutrons[J]. Nuclear Instruments and Methods in Physics Research A, 2011, 651(1): 161-165.
[5] 唐彬,张松宝,李西安,等. 热中子照相成像系统的研制[J]. 核电子学与探测技术,2006,26(1):84-87. TANG Bin, ZHANG Songbao, LI Xi’an, et al. Development of imaging system of thermal neutron radiography[J]. Nuclear Electronics & Detection Technology, 2006, 26(1): 84-87(in Chinese).
[6] LI H, ZOU Y B, LU Y R, et al. Preliminary study on neutron radiography with several hundred keV fast neutrons[J]. China Physics Letter, 2012, 29(11): 118701.
[7] 唐彬,周长庚,霍合勇,等. 14 MeV快中子数字照相初步实验研究[J]. 中国科学,2009,39(8):1 090-1 096. TANG Bin, ZHOU Changgeng, HUO Heyong, et al. The pilot experimental study of 14 MeV fast neutron digital radiography[J]. Science in China, 2009, 39(8): 1 090-1 096(in Chinese).
[8] SCHULZ M, BONI P, ELBIO B, et al. Energy-dependent neutron imaging with a double crystal monochromator at the ANTARES facility at FRM Ⅱ[J]. Nuclear Instruments and Methods in Physics Research A, 2009, 605: 33-35.
[9] MCFARLAND E W, LANZA R C, POULOSI G W. Multi-dimensional neutron-computed tomo-graphy using cooled charge-coupled devices[J]. IEEE Transactions on Nuclear Science, 1991, 38(2): 612-622.
[10] 裴宇阳,邹宇斌,郭之虞,等. 9Be(d,n)加速器中子源中子照相的研究[J]. 核技术,2007,30(4):265-268. PEI Yuyang, ZOU Yubin, GUO Zhiyu, et al. Research on neutron radiography of accelerator neutron source using D-Be reaction[J]. Nuclear Techniques, 2007, 30(4): 265-268(in Chinese).
[11] GUO Z Y, LU Y R, ZOU Y B, et al. Progress of PKUNIFTY: A RFQ accelerator based neutron imaging facility at Peking University[J]. Physics Procedia, 2013, 43: 79 -85.
[12] 郭纪美. 快中子断层成像技术及图像重建算法的研究[D]. 北京:北京大学,2010.
[13] KAARFI F, BOUKERDJA L, ATTARI A, et al. Implementation of neutron tomography around the Algerian Es-Salam research reactor: Preliminary studies and first steps[J]. Nuclear Instruments and Methods in Physics Research A, 2005, 542: 213-218.
[14] QU G R. Convergence of FBP algorithm for tomography[J]. Acta Mathematicae Applicatae Sinica, 2016, 32(4): 963-968.
[15] 高宇. 迭代重建算法的研究进展[J]. 中国医疗设备,2013,28(3):23-25. GAO Yu. The research progress of iterative reconstruction algorithm[J]. China Medical Devices, 2013, 28(3): 23-25(in Chinese).