Thermal neutron beam modification studies using an isotope based neutron radiography facility

Neutron radiography has established itself as one of the advanced NDT technique. Isotope based facilities are being developed to make the technique available for inplant use. Quality of neutron radiograph obtained is a function of beam parameters like flux, Cd ratio and neutron to gamma ratio, scattered neutrons etc. These parameters can be modified using design features of the facility. Effect of modifications in these parameters on final image quality has been studied and were found to be useful in meeting the widely varying radiographic requirements, particularly through an isotope based facility. These modifications can also overcome some of the inherent limitations of isotope based neutron radiography facilities.