Monte Carlo improvement of dose uniformity in gamma irradiation processing using the GEANT4 code

Abstract

This paper describes a Monte Carlo study on the improvement of dose uniformity within sample carriers, in the Tunisian gamma irradiation facility using the GEANT4 CERN’s code. To validate calculations, dose measurements using Red Perspex dosimeters were performed. The observed good agreement between simulation and experimental data, within a “dummy” product, indicates that the code was used in a correct way. In order to improve dose uniformity within products, three irradiation processing procedures were studied. For comparison purposes, boxes loaded with different density dummy products, were carried out.Based on these results, for a given carrier dimensions, more the product bulk density is higher than a calculated “critical density” more a specific procedure will be performed.