A New Version of MGA for Highly Attenuated Plutonium Samples
M. Koskelo, A. Savlov, D. Vzorov, R. Gunnink
Recently, materials have been encountered that are stored in lead-lined containers that greatly attenuate all low-energy radiation. Although previous versions of Multi Group Analysis (MGA) code allowed the user to include data from the high-energy region (200-1020 keV) in the analysis process, they required the use of two separate detectors since the low-energy region was still the primary region of analysis. Therefore, a new analysis mode recently has been added to MGA to allow a complete analysis to be made based on only the high-energy region of a spectrum. In addition to this high-energy, region-only mode, the newest version of MGA can still analyze the plutonium abundance in the traditional single, low-energy spectrum and the combination of low-energy and high-energy spectrum modes. But it is the new high-energy-only analysis mode that allows for the measurement and analysis of highly attenuated samples. In this paper, we will compare the results from low-energy-only and high-energy-only measurements and show that good results can be obtained with the new analysis mode.
This abstract was presented at the 32nd Annual Midyear Meeting, "Creation and Future Legacy of Stockpile Stewardship Isotope Production, Applications, and Consumption", Instrumentation, Monitors, and Devices Session, 1/24/1999 - 1/27/1999, held in Albuquerque, NM.