Abstract
One of the most useful non-destructive techniques for imaging low Z materials hidden behind high Z materials is fast neutron radiography (FNR). Inertial Electrostatic Confinement Fusion (IECF) as a small neutron source is an excellent apparatus for neutron radiography because of its ability to generate high-flux fast neutrons. In this study, the effects of geometric parameters on images obtained by a FNR system were investigated using MCNPX2.7 Monte-Carlo code. Geometric unsharpness can be reduced by optimizing the source-object and object-detector distance. The results showed that the contribution of scattered neutrons is approximately 0.1 % of that of transmitted ones for object-detector distances greater than five times the size of the side of the object perpendicular to the beam axis. The optimal detector-object distance was 50 cm. By increasing the source- object distance, better contrast and a higher fitting between the image and the object in terms of the position was observed. The optimal source-object distance was considered 150 cm.
Published Version
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