Design and Optimization of Shielding Collimator System for 14 MeV Fast Neutron Radiography

WANG Jie; LI Yanan; LI Taosheng; WANG Yongfeng

doi:10.7538/yzk.2018.youxian.0527

Atomic Energy Science and Technology > 2019 > 53(6): 1105-1111. > DOI: 10.7538/yzk.2018.youxian.0527

WANG Jie, LI Yanan, LI Taosheng, WANG Yongfeng. Design and Optimization of Shielding Collimator System for 14 MeV Fast Neutron Radiography[J]. Atomic Energy Science and Technology, 2019, 53(6): 1105-1111. DOI: 10.7538/yzk.2018.youxian.0527

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Design and Optimization of Shielding Collimator System for 14 MeV Fast Neutron Radiography

1.
Key Laboratory of Neutronics and Radiation Safety, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei 230031, China
2.
University of Science and Technology of China, Hefei 230026, China

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Abstract

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 Φ30 cm,φ_d and its uniformity are about 50.1, 5.7, 4.80×10⁷cm^-2•s^-1,4.09×10⁷ cm^-2•s^-1 and 5.8% respectively, which can meet the need of fast neutron radiography facility.
- fast neutron radiography,
- shielding collimator system,
- neutron source,
- SuperMC,
- MCNP

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