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

TL;DR

This paper addresses image distortions in fast neutron radiography at NECTAR by analyzing the neutron spectrum and modeling scattering effects, leading to improved image quality through correction methods.

Contribution

It introduces a method to correct for neutron spectrum and scattering effects, enhancing image quality in fast neutron radiography at NECTAR.

Findings

Neutron spectrum analysis improves correction accuracy.

Monte Carlo simulation effectively models scattering effects.

Corrections significantly enhance image clarity.

Abstract

Neutron spectrum and scattered neutrons caused distortions 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-II in Technische Universit\"at M\"unchen (TUM), Germany. The NECTAR energy spectrum is analyzed and established to modify the influence caused by neutron spectrum, as well as the Point Scattered Function (PScF) simulated by the Monte-Carlo program MCNPX is used to evaluate scattering effects from the object and improve images qualities. Good analysis results prove the sounded effects of above two corrections.