Year
1998
Abstract
As more NDA instrumentation is being added at facilities, cross calibration of the instrumentation is becoming increasingly important. Specifically, we have experienced a need for the application of cross calibration to Californium Shufflers. The Portsmouth Uranium Enrichment Plant has two shufflers which provide an ideal situation for cross calibration studies. Approximately six years ago a full calibration was performed on one of the shufflers. This calibration involved many different matrices of varying densities. The calibration data was transferred to the second instrument, which was then normalized to the first. This paper presents a comparison of data obtained from the two shufflers based on the cross calibration technique. The comparison study provides evidence that there is good correlation between the results in grams of the two instruments. The gram results of the two instruments were within one sigma error limits. However, a comparison of corrected count rates, based on counting statistics, showed that the count rates were not as closely related as the gram results. This larger variation in count rates is due, in large, to matrix geometric positioning error and calibration error which are not included in the counting statistic comparison.