Analyse quantitative experimentale et theorique de la transmission neutronique a travers les materiaux de blindage

Abstract

The main objective of this work is the proper analysis of neutron transmission data and establishing the characteristics of the neutron attenuation of strong absorbing materials. This is to highlight the effect of beam hardening and its influence on the shielding calculation and its contribution in generating errors in the reconstruction of neutron transmission tomography image. In this work, we propose the spectrometric characterization and modeling of the neutron transmission of strong absorbing materials through experimental, analytical and Monte-Carlo calculation by appropriate codes. Weak and fair absorber materials have been studied for comparison purposes. On light of the obtained results, theoretical models are constructed using calculation codes for the measured data interpretation. Procedures for correcting measured data by neutron transmission have been developed to remedy to beam hardening effects errors in neutron transmission tomography.