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 preliminar...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.展开更多
基金Supported by National Natural Science Foundation of China(11105160)
文摘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.
