Corrections on energy spectrum and scatterings for fast neutron radiography at NECTAR facility

【摘要】 Distortions caused by the neutron spectrum and scattered neutrons are major problems in fast neutron radiography and should be considered for improving the image quality.This paper puts emphasis on the removal of these image distortions and deviations for fast neutron radiography performed at the NECTAR facility of the research reactor FRM-in Technische Universita¨t Mu¨nchen(TUM),Germany.The NECTAR energy spectrum is analyzed and established to modify the influence caused by the neutron spectrum,and the Point Scattered Function(PScF)simulated by the Monte-Carlo program MCNPX is used to evaluate scattering efects from the object and improve image quality.Good analysis results prove the sound efects of the above two corrections.更多还原

【Abstract】 Distortions caused by the neutron spectrum and scattered neutrons are major problems in fast neutron radiography and should be considered for improving the image quality. This paper puts emphasis on the removal of these image distortions and deviations for fast neutron radiography performed at the NECTAR facility of the research reactor FRM- in Technische Universita¨t Mu¨nchen(TUM), Germany. The NECTAR energy spectrum is analyzed and established to modify the influence caused by the neutron spectrum, and the Point Scattered Function(PScF) simulated by the Monte-Carlo program MCNPX is used to evaluate scattering efects from the object and improve image quality. Good analysis results prove the sound efects of the above two corrections.更多还原