Neutron collimator design of neutron radiography based on the BNCT facility

• 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
• 机 构: School of Physics and Nuclear Energy Engineering, Beihang University,State Key Laboratory of Particl
• 出 处: Chinese Physics C
• 发表日期: 2014年02期
• 关键词: neutron radiography facility preliminary gamma bismuth nuclei aperture boron cho

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 1.0×106n/cm2/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.

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. materials were selected according to the literature data. Chen, 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 6 n / 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.