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Penumbral imaging and numerical evaluation of large area source neutron imaging system |
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| Authors: | YueLei Wu HuaSi Hu BoPing Zhang LinBo Li Da Chen Qing Shan Jie Zhu |
| Affiliation: | (1) School of Nuclear Science & Technology, Xi’an Jiaotong University, Xi’an, 710049, China;(2) Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China;(3) College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China;(4) Xi’an Research Institute of Hi-Tech, Xi’an, 710025, China |
| Abstract: | The fusion neutron penumbral imaging system Monte Carlo model was established. The transfer functions of the two discrete units in the neutron source were obtained in two situations: Imaging in geometrical near-optical and real situation. The spatial resolutions of the imaging system in two situations were evaluated and compared. The penumbral images of four units in the source were obtained by means of 2-dimensional (2D) convolution and Monte Carlo simulation. The penumbral images were reconstructed with the same method of filter. The same results were confirmed. The encoding essence of penumbral imaging was revealed. With MCNP(Monte Carlo N-particle) simulation, the neutron penumbral images of the large area source (200 μm×200 μm) on scintillation fiber array were obtained. The improved Wiener filter method was used to reconstruct the penumbral image and the source image was obtained. The results agree with the preset neutron source image. The feasibility of the neutron imaging system was verified. Supported by the NSAF Joint Fund set up by NSFC and CAEP (Grant No. 10576022) |
| Keywords: | penumbral imaging reconstruction unit source spatial invariance spatial resolution MCNP code |
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