GREASE: Gamma-Ray Exportable Adjustable Spectrum Evolution
GREASE provides nuclear forensics and fissile material experimenters with fast, customizable gamma-ray spectrum simulations, allowing detailed analysis of fission product contributions and detector responses
Analyzing gamma-ray spectra from fission products is essential for nuclear forensics and material testing. GREASE offers a fast, precise simulation of gamma-ray spectra, with customizable overlays for isotope contributions and energy windows, providing experimenters with detailed insights into radiation detection and isotope analysis.
In nuclear forensics and fissile material research, precise gamma-ray spectrum analysis is crucial for identifying and tracking isotopes during and after neutron irradiation experiments. While tools like ORIGEN or GADRAS offer some related functionality, they lack the flexibility and detailed output that GREASE provides. GREASE allows users to not only simulate gamma-ray spectra from fission products but also customize the data to fit specific analysis needs, including overlaying contributions from individual isotopes or energy ranges.
GREASE starts with an initial number of fissions on fissile or fissionable material, generating a fission product (FP) inventory based on ENDF/TENDL libraries. Using the Bateman equations, it calculates how these products decay over time. The software simulates the response of a high-purity germanium (HPGe) detector, modeling every gamma-ray from the ENDF/TENDL libraries. This response is then multiplied by the activity of each fission product to provide a full, energy-dependent detector output, including the effects of dead time. Users can customize the analysis by overlaying isotope contributions and selecting specific energy windows for closer inspection. The results can be exported in formats compatible with tools like PeakEasy (.spe files), Excel, or text files, enabling further analysis.
Advantages:
• Provides detailed gamma-ray spectrum analysis based on customizable parameters.
• Outputs detector response simulations for HPGe detectors, including dead time effects.
• Allows overlay of individual isotope contributions and selected energy windows for detailed inspection.
• Generates results quickly, within 1-3 seconds depending on input complexity.
• Compatible with follow-up tools like MicroShield and PeakEasy for further analysis.
Applications:
• Gamma-ray spectrum analysis for nuclear forensics.
• Fission product inventory tracking for fissile material experiments.
• Radiation detector response simulation for HPGe detectors.
• Customizable isotope contribution analysis in neutron irradiation experiments.
• Government research involving nuclear forensics or radiation detection.
This software is a controlled nuclear code, subject to a special release process due to its sensitive nature. Please visit the Nuclear Computational Resource Center and create an account to request access.