Analysis of a Prototype Multi-DetectorFast-Neutron Radiography Panel

Abstract A multi-detector fast neutron radiography panel was built using the pre-vious work on scalable neutron radiography using the IDEAS ROSSPADreadout module. A new aluminum housing was built to accommodate a large number of detectors tiled together. Additional changes tostartup and processing code were made to operate the detector as onecohesive unit. Spatial resolution of the full panel using Cs-137 gammas was reported to be 0.42 line pairs per centimeter at 90% MTFand 2.09 line pairs per centimeter at 10% MTF. Three neutron radio-graphs generated using a Cf-252 fission neutron source were used todetermine the spatial resolution of the panel for neutrons. The experiments had 90% MTF values of 0.24, 0.3, and 0.27 line pairs percentimeter and 10% MTF values of 1.30, 1.46, and 1.40 line pairs percentimeter. An example neutron radiograph was also used to provethat the radiography panel can perform true neutron radiography.