Monte-Carlo simulation of scattering correction for quantitative neutron imaging system

Neutron digital imaging is a low light level imaging technique. It is difficult to extract the quantitative information of samples due to the image degradation caused by scattering neutrons in the imaging process. In this situation, the principle of so-called scattering degradation of the low light level neutron imaging system is analyzed, and the degradation process in this system is characterized by point spread function(PSF) superposition. Using Monte Carlo method, the PSF is simulated and modeled as an analytical function of two parameters, the thickness of sample and the distance from sample to detector, and then the calculation method of PSF is presented. The result shows that constructing the PSF of this system and applying it to scattering correction for neutron images is an effective scattering correction method for quantitative neutron radiography, which has the theoretically guiding significance for reducing the adverse effect on imaging quality induced by scattering neutrons. (authors)