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Advances in both instrumentation and data analysis software are now enablingthe first ultra-high-resolution microcalorimeter gamma spectrometers designedfor implementation in nuclear facilities and analytical laboratories. Withapproximately ten times better energy resolution than high-purity germaniumdetectors, these instruments can overcome important uncertainty limits.Microcalorimeter gamma spectroscopy is intended to provide nondestructiveisotopic analysis capabilities with sufficient precision and accuracy to reducethe need for sampling, chemical separations, and mass spectrometry to meetsafeguards and security goals. Key milestones were the development of the SOFIAinstrument (Spectrometer Optimized for Facility Integrated Applications) andthe SAPPY software (Spectral Analysis Program in PYthon). SOFIA is a compactinstrument that combines advances in large multiplexed transition-edge sensorarrays with optimized cryogenic performance to overcome many practicallimitations of previous systems. With a 256-pixel multiplexed detector arraycapable of 5000 counts per second, measurement time can be comparable tohigh-purity germanium detectors. SAPPY was developed to determine isotopicratios in data from SOFIA and other microcalorimeter instruments with anapproach similar to the widely-used FRAM software. SAPPY provides a flexibleframework with rigorous uncertainty analysis for both microcalorimeter and HPGedata, allowing direct comparison. We present current results from the SOFIAinstrument, preliminary isotopic analysis using SAPPY, and describe how thetechnology is being used to explore uncertainty limits of nondestructiveisotopic characterization, inform safeguards models, and extract improvednuclear data including gamma-ray branching ratios.

Improved Nondestructive Isotopic Analysis with Practical Microcalorimeter Gamma Spectrometers