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首次系统地推导出快中子照相像素值形成解析式, 建立图像反差不等式, 并利用该不等式首次对图像对比度与源强、照射时间和散射之间的关系进行说明. 并在像素值解析式基础上编制快中子照相模拟程序, 利用该程序对空间分辨率和图像对比度进行模拟, 并与实验对照, 研究结果表明空间分辨率模拟效果好于实验, 图像对比度模拟效果与实验相当. 最后通过对狭缝、方孔以及多材质组成的复杂样品模拟并与实验对照, 结果显示模拟效果与实验照片在反差灵敏度效果上非常一致, 该模拟计算方法可为实验设计和工程应用提供参考.
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关键词:
- 快中子照相 /
- 空间分辨力 /
- 对比度 /
- Monte Carlo模拟
Expression for the formation of the pixel value of fast neutron radiography has been derived. The contrast inequality for the photograph has been established using the derived expression; then the relationships of the image contrast with the source intensity, the exposure time, and the scattering have therefore been obtained through the acquired inequality. A simulation on the process of fast neutron radiography is carried out based on the pixel value analysis, and the spatial resolution and image contrast have also been considered. Simulation results show that the spatial resolution is better than that from experiments and the effect of image contrast is equivalent to that of the experiments. Finally, various samples, such as Pb samples, with slits, Fe samples with square holes and multiple materials-combined samples, are used to test the performance of the simulation. Results demonstrate that the simulations are in agreement with the experiments, thus providing a reference to the future experimental design and engineering application.-
Keywords:
- fast neutron radiography /
- spatial resolution /
- contrast /
- Monte Carlo simulation
[1] Zhang F Q, Yang J L, Li Z H, Zhong Y H, Ye F, Qin Y, Chen F X, Ying C T, Liu G J 2007 Acta Phys. Sin. 56 0583(in Chinese) [章法强, 杨建伦, 李正宏, 钟耀华, 叶凡, 秦义, 陈法新, 应纯同, 刘广均 2007 物理学报 56 0583]
[2] Mongy T 2014 Applied Radiation and Isotopes. 85 54
[3] Tang V, Falabella S, Rusnak B, Wang H, Hall J, McCarrick J, Ker P, Ellsworth J 2012 LLNL-PROC-568672
[4] Tang B, Zhou C G, Huo H Y, Wu Y, Liu B, Lou B C 2009 Sci. China Ser. G 8 1090(in Chinese) [唐彬, 周长庚, 霍合勇, 吴洋, 刘斌, 娄本超 2009 中国科学G辑 8 1090]
[5] Hall J, Rusnak B, Fitsos P J 2007 Proceedings of 8th World Conference on Neutron Radiography, UCRL-CONF-230835
[6] Rusnak B, Hall J, Fitsos P, Souza R, Jong M Proceedings of PAC07
[7] Bishnoi S, Thomas R G, Sarkar P S, Datar V M, Sinha A 2015 JINST
[8] Han W, Tang V 2013 Nuclear Instruments and Methods in Physics Research A 729 728
[9] Tharwat M, Mohamed N, Mongy T 2014 Applied Radiation and Isotopes 89 30
[10] Zhang F Q, Yang J L, Li Z H, Ying C T, Liu G J 2007 Acta Phys. Sin. 56 3577(in Chinese) [章法强, 杨建伦, 李正宏, 应纯同, 刘广均 2007 物理学报 56 3577]
[11] Andersson P, Valldor B J, Andersson S E 2014 Nuclear Instruments and Methods in Physics Research A 756 82
[12] Zboray R, Mor I, Dangendorf V 2014 Applied Radiation and Isotopes 90 122
[13] Guo L A, Zhang G H, Zou Y B, Tang G Y, Guo Z Y, Xu J G, Guo J M 2009 Nuclear Instruments and Methods in Physics Research A 598 826
[14] Fujine S, Yoneda K, Yoshii K, Kamata M, Tamaki M, Ohkubo K, Ikeda Y, Kobayashi H 1999 Nuclear Instruments and Methods in Physics Research A 424 190
[15] Mohamed H 2009 Nuclear Instruments and Methods in Physics Research B 267 2545
[16] Zhang F Q, Qi J M, Zhang J H, Li L B, Chen D Y, Xie H W, Yang J L, Chen J C 2014 Acta Phys. Sin. 63 128701(in Chinese) [章法强, 祁建敏, 张建华, 李林波, 陈定阳, 谢红卫, 杨建伦, 陈进川 2014 物理学报 63 128701]
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[1] Zhang F Q, Yang J L, Li Z H, Zhong Y H, Ye F, Qin Y, Chen F X, Ying C T, Liu G J 2007 Acta Phys. Sin. 56 0583(in Chinese) [章法强, 杨建伦, 李正宏, 钟耀华, 叶凡, 秦义, 陈法新, 应纯同, 刘广均 2007 物理学报 56 0583]
[2] Mongy T 2014 Applied Radiation and Isotopes. 85 54
[3] Tang V, Falabella S, Rusnak B, Wang H, Hall J, McCarrick J, Ker P, Ellsworth J 2012 LLNL-PROC-568672
[4] Tang B, Zhou C G, Huo H Y, Wu Y, Liu B, Lou B C 2009 Sci. China Ser. G 8 1090(in Chinese) [唐彬, 周长庚, 霍合勇, 吴洋, 刘斌, 娄本超 2009 中国科学G辑 8 1090]
[5] Hall J, Rusnak B, Fitsos P J 2007 Proceedings of 8th World Conference on Neutron Radiography, UCRL-CONF-230835
[6] Rusnak B, Hall J, Fitsos P, Souza R, Jong M Proceedings of PAC07
[7] Bishnoi S, Thomas R G, Sarkar P S, Datar V M, Sinha A 2015 JINST
[8] Han W, Tang V 2013 Nuclear Instruments and Methods in Physics Research A 729 728
[9] Tharwat M, Mohamed N, Mongy T 2014 Applied Radiation and Isotopes 89 30
[10] Zhang F Q, Yang J L, Li Z H, Ying C T, Liu G J 2007 Acta Phys. Sin. 56 3577(in Chinese) [章法强, 杨建伦, 李正宏, 应纯同, 刘广均 2007 物理学报 56 3577]
[11] Andersson P, Valldor B J, Andersson S E 2014 Nuclear Instruments and Methods in Physics Research A 756 82
[12] Zboray R, Mor I, Dangendorf V 2014 Applied Radiation and Isotopes 90 122
[13] Guo L A, Zhang G H, Zou Y B, Tang G Y, Guo Z Y, Xu J G, Guo J M 2009 Nuclear Instruments and Methods in Physics Research A 598 826
[14] Fujine S, Yoneda K, Yoshii K, Kamata M, Tamaki M, Ohkubo K, Ikeda Y, Kobayashi H 1999 Nuclear Instruments and Methods in Physics Research A 424 190
[15] Mohamed H 2009 Nuclear Instruments and Methods in Physics Research B 267 2545
[16] Zhang F Q, Qi J M, Zhang J H, Li L B, Chen D Y, Xie H W, Yang J L, Chen J C 2014 Acta Phys. Sin. 63 128701(in Chinese) [章法强, 祁建敏, 张建华, 李林波, 陈定阳, 谢红卫, 杨建伦, 陈进川 2014 物理学报 63 128701]
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