Radiography Experiments at Argonne National Laboratory

Several neutron radiography experiments were done at the Neutron Radiography Reactor facility, Argonne National Laboratory, Idaho Falls, Idaho. Square samples of cadmium were exposed to collimated neutrons (L/D = 185 and 300) to determine the width of the squares. Two methods of analysis, the arctangent fitting technique and the differential smoothing technique, were applied to data produced by microdensitometer measurements of several types of film. The results were compared for accuracy and precision with a carefully calibrated measurement of the samples. From the mathematical analysis a resolution parameter is obtained that might serve as a facility calibration parameter.