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Thin-film approximate point scattered function and its application to neutron radiography

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Nuclear Science and Techniques 2022年第9期33卷 1-9页

作者： Jun Qin Jia-Yu Ni Lin-Feng Ye De-Hong Gao Wei-Jun Jiang Department of Nuclear Engineering and New Energy Technology The College of Engineering and Technology of Chengdu University of TechnologyLeshan 614000SichuanChina Society for Theoretical and Computational Physics The College of Engineering and Technology of Chengdu University of TechnologyLeshan 614000SichuanChina

A simpler and improved utility approximate point scattered function for thin-film converters currently used in neutron photographic devices is proposed as a correction method to produce clearer,more realistic *** validity of the model was demonstrated through a simulation *** on the results,an error analysis was carried out,certain corrections were made to the original model,and the final model achieved a very low relative error in the simulation *** model can also be optimized for quantitative neutron photographic analysis using iterative algorithms to obtain realistic neutron photographic images more *** the end of the article,the model is extended to consider the case of energy spectrum hardening by introducing a temperature correction parameter.

关键词： neutron radiography Point scattered function Image processing

neutron collimator design of neutron radiography based on the BNCT facility

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Chinese Physics C 2014年第2期38卷 97-100页

作者：杨晓鹏俞伯祥李义国彭旦鲁谨张高龙赵航章爱武李春阳刘万金胡涛吕军光 School of Physics and Nuclear Energy Engineering Beihang University State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of Sciences China Institute of Atomic Energy University of South China

For the research of CCD neutron radiography, a neutron collimator was designed based on the exit of thermal neutron of the Boron neutron Capture Therapy（BNCT） reactor. Based on the Geant4 simulations, the preliminary choice of the size of the collimator was determined. The materials were selected according to the literature data. Then, a collimator was constructed and tested on site. The results of experiment and simulation show that the thermal neutron flux at the end of the neutron collimator is greater than 1.0×10^6n/cm^2/s, the maximum collimation ratio（L/D） is 58, the Cd-ratio（Mn） is 160 and the diameter of collimator end is 10 cm. This neutron collimator is considered to be applicable for neutron radiography.

关键词： neutron radiography ICCD camera thermal neutron collimator thermal neuron flux collimation ratio(L/D

STUDY　ON　MODERATORS　OF　SMALL－SIZE　neutron　radiography　INSTALLATIONS　WITH　neutron　TUBE　AS　SOURCE

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Nuclear Science and Techniques 1995年第3期6卷 129-134页

作者：马维超周明达李忠民吴执中

Calculation of moderator analogues for 14 MeV neutrons as source were made at a IBM/PC AT computer using TAMAKER-ANISN program and 46 groups (25 neutron groups, 21 photon groups) UW cross section data. The intensifying effect of lead and natural uranium for moderating 14 MeV neutrons is confirmed. Adopting proper structure of the moderator, the intensifying factor M (times) may be larger than 3. Using lead and natural uranium in sub-critical assemblies (or call boosters),with 14 MeV neutrons as source, with the same dimension as that of above, the intensifying effect is also condrmed. With a proper structure of sub-critical assembly,the intensifying factor M may be close to or eved larger than (1 - k)-1 where k isthe effective multiplication factor.

关键词： Sealed neutron tube neutron radiography Moderator Intensifying matenals Computer calculations

neutron radiography of Space Pyrotechnics

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Tsinghua Science and Technology 1996年第1期1卷 66-69页

作者：貊大卫刘以思蔡庆胜

The research work, facilities, and results of NDT testing of space pyrotechnics in China using neutron radiography (NR) at the Tsinghua University swimming-pool reactor are introduced in this paper. The image quality (NR) approached the standard of ASTM E 545-86 level I. NR experimental research of typical and possible defects was performed along with a theoretical analysis. The feasibility of using NR NDT (non-destructive testing) for space pyrotechnics was proven experimentally. Space detonating cord is tested with neutron radiography. The detonating cord with artificial explosive charge defects as a reference is put into every neutron radiography film. Slagging of the lead cladding and explosive charge inhomogeneity are discovered.

关键词： neutron radiography space pyrotechnics NDT

neutron radiography System Collimator Design via Monte Carlo Calculation

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Journal of Energy and Power Engineering 2011年第12期5卷 1168-1172页

作者： H. Jafari M. Shahriari Department of Radiation Application Shahid Beheshti University Tehran *** Iran

neutron radiography uses the unique interaction probabilities of neutrons to create images of materials. This imaging technique is non-destructive. MCNP Monte Carlo Code has been used to design an optimized neutron radiography system that utilizes 241Am-Be neutron source. Many different arrangements have been simulated to obtain a neutron flux with higher amplitude and more uniform distribution in the collimator outlet, next to image plane. In the final arrangement the specifications of neutron filter, Gamma-ray shield and beam collimator has been determined. Simulations has been carried out for a 5Ci 241Am-Be neutron source. In this case 43.8 n/cm2s thermal neutron flux has been achieved at a distance of 35 cm from neutron source.

关键词： 241Am-Be radioisotope source neutron radiography Monte Carlo collimator.

The review and prospect of neutron radiography in China

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Engineering Sciences 2009年第4期7卷 68-75页

作者： Tang Bin Mo Dawei Huo Heyong Wu Yang Liu Bin Sun Yong Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics MianyangSichuan 621900 China Institute of Nuclear Energy Technology Tsinghua University Beijing 100084 China

neutron radiography is one of radiography non-destructive *** is a valuable complementary of X and γ rays *** present status and history of neutron radiography in China was described briefly,facilities of neutron rad... 详细信息

关键词： China neutron radiography non-destructive testing history development

Multi-distortion suppression for neutron radiographic images based on generative adversarial network

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Nuclear Science and Techniques 2024年第4期35卷 176-188页

作者： Cheng-Bo Meng Wang-Wei Zhu Zhen Zhang Zi-Tong Wang Chen-Yi Zhao Shuang Qiao Tian Zhang School of Physics Northeast Normal UniversityChangchun 130024China

neutron radiography is a crucial nondestructive testing technology widely used in the aerospace,military,and nuclear ***,because of the physical limitations of neutron sources and collimators,the resulting neutron radiographic images inevitably exhibit multiple distortions,including noise,geometric unsharpness,and white ***,these distortions are particularly significant in compact neutron radiography systems with low neutron ***,in this study,we devised a multi-distortion suppression network that employs a modified generative adversarial network to improve the quality of degraded neutron radiographic *** neutron radiographic image datasets with various types and levels of distortion were built for the first time as multi-distortion suppression ***,the coordinate attention mechanism was incorporated into the backbone network to augment the capability of the proposed network to learn the abstract relationship between ideally clear and degraded *** experiments were performed;the results show that the proposed method can effectively suppress multiple distortions in real neutron radiographic images and achieve state-of-theart perceptual visual quality,thus demonstrating its application potential in neutron radiography.

关键词： neutron radiography Multi-distortion suppression Generative adversarial network Coordinate attention mechanism